Vijetove formulesu tvoj najbolji prijatelj kada radiš sa kvadratnim... Show more
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Updated Apr 17, 2026
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Vijetove formule: Veza između koeficijenata i rešenja
1 / 6
Uvod u Vijetove formule
Zamisli da možeš da saznaš važne informacije o rešenjima kvadratne jednačine bez da je potpuno rešavaš - to je upravo ono što Vijetove formule čine! One povezuju koeficijente jednačine sa njenim rešenjima.
Za standardnu kvadratnu jednačinu ax² + bx + c = 0 (gde a ≠ 0), gde su x₁ i x₂ rešenja, imaš dve ključne formule:
• Zbir rešenja: x₁ + x₂ = -b/a
• Proizvod rešenja: x₁ · x₂ = c/a
💡 Pazi na minus! Najčešća greška je zaboravljanje minusa kod formule za zbir rešenja.
Zapamti: a, b i c su koeficijenti tvoje jednačine - a je uz x², b uz x, a c je slobodan član.
Detaljno objašnjenje i izvođenje
Da razumeš zašto Vijetove formule funkcionišu, pogledaj kako nastaju iz opšte formule za rešavanje kvadratnih jednačina. Ovo nije samo teorija - pomoći će ti da bolje zapamtiš!
Iz formule x₁,₂ = /2a, gde je D = b² - 4ac, možeš izvesti:
Za zbir rešenja: Kada sabereš x₁ i x₂, √D se pokrati i dobiješ x₁ + x₂ = -2b/2a = -b/a.
Za proizvod rešenja: Kada pomnojiš x₁ i x₂, koristiš razliku kvadrata i dobiješ x₁ · x₂ = c/a.
⚠️ Važna napomena: Jednačina mora biti u obliku ax² + bx + c = 0 pre primene formula!
Ove formule rade čak i kada rešenja nisu realna - zbir i proizvod će uvek biti realni brojevi.
Primena na složenije izraze
Ovde postaje stvarno zanimljivo! Možeš da transformišeš komplikovane izraze tako da zavise samo od zbira i proizvoda rešenja. Ovo je moćan alat za brže rešavanje.
Najčešće transformacije:
• Zbir kvadrata: x₁² + x₂² = ² - 2x₁x₂
• Zbir recipročnih vrednosti: 1/x₁ + 1/x₂ = /(x₁x₂)
• Zbir kubova: x₁³ + x₂³ = ³ - 3x₁x₂
Ključ je da prepoznaš obrasce i koristiš algebarske identitete poput kvadrata binoma i zbira kubova.
🎯 Pro tip: Uvek pokušaj da složeni izraz svedeš na kombinaciju x₁ + x₂ i x₁x₂!
Ovo ti štedi vreme jer ne moraš da rešavaš jednačinu - samo primeniš Vijetove formule i računaš dalje.
Rešeni primeri - deo 1
Primer 1: Za jednačinu 2x² - 7x + 5 = 0, pronađi zbir i proizvod rešenja.
Identifikuješ koeficijente: a = 2, b = -7, c = 5
Primenjuješ formule:
• Zbir: x₁ + x₂ = -(-7)/2 = 7/2
• Proizvod: x₁ · x₂ = 5/2 = 5/2
Primer 2: Za x² + 4x - 21 = 0, izračunaj x₁² + x₂².
Prvo nađeš: x₁ + x₂ = -4, x₁ · x₂ = -21
Zatim koristiš transformaciju: x₁² + x₂² = ² - 2x₁x₂ = (-4)² - 2(-21) = 16 + 42 = 58
💪 Zapamti: Nikad ne moraš da rešavaš kompletno jednačinu - formule rade sve umesto tebe!
Rešeni primeri - deo 2 i kreiranje jednačina
Primer 3: Sastavi kvadratnu jednačinu čija su rešenja za 3 veća od rešenja jednačine x² - 5x + 6 = 0.
Za početnu jednačinu: x₁ + x₂ = 5, x₁ · x₂ = 6
Nova rešenja su y₁ = x₁ + 3 i y₂ = x₂ + 3:
• Zbir novih: y₁ + y₂ = + 6 = 5 + 6 = 11
• Proizvod novih: y₁ · y₂ = = x₁x₂ + 3 + 9 = 6 + 15 + 9 = 30
Nova jednačina: y² - 11y + 30 = 0
🔥 Ključna veština: Kada znaš zbir i proizvod rešenja, možeš sastaviti jednačinu u obliku x² - (zbir)x + (proizvod) = 0!
Važne napomene: Pazi na znakove, uvek sređuj jednačinu u standardni oblik pre čitanja koeficijenata, i zapamti da formule važe čak i za kompleksna rešenja.
Kratak pregled za test
Evo svega što moraš da znaš napamet za uspešno rešavanje zadataka:
Osnovne formule:
• Standardni oblik: ax² + bx + c = 0
• Zbir rešenja: x₁ + x₂ = -b/a
• Proizvod rešenja: x₁ · x₂ = c/a
Kreiranje jednačine: Ako znaš rešenja x₁ i x₂, jednačina je x² - x + x₁x₂ = 0
Najvažnije transformacije:
• x₁² + x₂² = ² - 2x₁x₂
• 1/x₁ + 1/x₂ = /(x₁x₂)
✅ Test strategija: Uvek prvo identifikuj a, b, c, zatim pažljivo primeni formule - i ne zaboravi minus kod zbira!
Sa ovim znanjem možeš brzo i efikasno da rešavaš zadatke sa kvadratnim jednačinama bez dugotrajnih kalkulacija.
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in Matematika
Most popular content
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Vijetove formule: Veza između koeficijenata i rešenja
Vijetove formule su tvoj najbolji prijatelj kada radiš sa kvadratnim jednačinama! Ove formule ti omogućavaju da saznаš zbir i proizvod rešenja bez mučnog rešavanja cele jednačine - što je savršeno za brže rešavanje na testovima i kontrolnim.
Uvod u Vijetove formule
Zamisli da možeš da saznaš važne informacije o rešenjima kvadratne jednačine bez da je potpuno rešavaš - to je upravo ono što Vijetove formule čine! One povezuju koeficijente jednačine sa njenim rešenjima.
Za standardnu kvadratnu jednačinu ax² + bx + c = 0 (gde a ≠ 0), gde su x₁ i x₂ rešenja, imaš dve ključne formule:
• Zbir rešenja: x₁ + x₂ = -b/a
• Proizvod rešenja: x₁ · x₂ = c/a
💡 Pazi na minus! Najčešća greška je zaboravljanje minusa kod formule za zbir rešenja.
Zapamti: a, b i c su koeficijenti tvoje jednačine - a je uz x², b uz x, a c je slobodan član.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Detaljno objašnjenje i izvođenje
Da razumeš zašto Vijetove formule funkcionišu, pogledaj kako nastaju iz opšte formule za rešavanje kvadratnih jednačina. Ovo nije samo teorija - pomoći će ti da bolje zapamtiš!
Iz formule x₁,₂ = /2a, gde je D = b² - 4ac, možeš izvesti:
Za zbir rešenja: Kada sabereš x₁ i x₂, √D se pokrati i dobiješ x₁ + x₂ = -2b/2a = -b/a.
Za proizvod rešenja: Kada pomnojiš x₁ i x₂, koristiš razliku kvadrata i dobiješ x₁ · x₂ = c/a.
⚠️ Važna napomena: Jednačina mora biti u obliku ax² + bx + c = 0 pre primene formula!
Ove formule rade čak i kada rešenja nisu realna - zbir i proizvod će uvek biti realni brojevi.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Primena na složenije izraze
Ovde postaje stvarno zanimljivo! Možeš da transformišeš komplikovane izraze tako da zavise samo od zbira i proizvoda rešenja. Ovo je moćan alat za brže rešavanje.
Najčešće transformacije:
• Zbir kvadrata: x₁² + x₂² = ² - 2x₁x₂
• Zbir recipročnih vrednosti: 1/x₁ + 1/x₂ = /(x₁x₂)
• Zbir kubova: x₁³ + x₂³ = ³ - 3x₁x₂
Ključ je da prepoznaš obrasce i koristiš algebarske identitete poput kvadrata binoma i zbira kubova.
🎯 Pro tip: Uvek pokušaj da složeni izraz svedeš na kombinaciju x₁ + x₂ i x₁x₂!
Ovo ti štedi vreme jer ne moraš da rešavaš jednačinu - samo primeniš Vijetove formule i računaš dalje.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
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Rešeni primeri - deo 1
Primer 1: Za jednačinu 2x² - 7x + 5 = 0, pronađi zbir i proizvod rešenja.
Identifikuješ koeficijente: a = 2, b = -7, c = 5
Primenjuješ formule:
• Zbir: x₁ + x₂ = -(-7)/2 = 7/2
• Proizvod: x₁ · x₂ = 5/2 = 5/2
Primer 2: Za x² + 4x - 21 = 0, izračunaj x₁² + x₂².
Prvo nađeš: x₁ + x₂ = -4, x₁ · x₂ = -21
Zatim koristiš transformaciju: x₁² + x₂² = ² - 2x₁x₂ = (-4)² - 2(-21) = 16 + 42 = 58
💪 Zapamti: Nikad ne moraš da rešavaš kompletno jednačinu - formule rade sve umesto tebe!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Rešeni primeri - deo 2 i kreiranje jednačina
Primer 3: Sastavi kvadratnu jednačinu čija su rešenja za 3 veća od rešenja jednačine x² - 5x + 6 = 0.
Za početnu jednačinu: x₁ + x₂ = 5, x₁ · x₂ = 6
Nova rešenja su y₁ = x₁ + 3 i y₂ = x₂ + 3:
• Zbir novih: y₁ + y₂ = + 6 = 5 + 6 = 11
• Proizvod novih: y₁ · y₂ = = x₁x₂ + 3 + 9 = 6 + 15 + 9 = 30
Nova jednačina: y² - 11y + 30 = 0
🔥 Ključna veština: Kada znaš zbir i proizvod rešenja, možeš sastaviti jednačinu u obliku x² - (zbir)x + (proizvod) = 0!
Važne napomene: Pazi na znakove, uvek sređuj jednačinu u standardni oblik pre čitanja koeficijenata, i zapamti da formule važe čak i za kompleksna rešenja.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Kratak pregled za test
Evo svega što moraš da znaš napamet za uspešno rešavanje zadataka:
Osnovne formule:
• Standardni oblik: ax² + bx + c = 0
• Zbir rešenja: x₁ + x₂ = -b/a
• Proizvod rešenja: x₁ · x₂ = c/a
Kreiranje jednačine: Ako znaš rešenja x₁ i x₂, jednačina je x² - x + x₁x₂ = 0
Najvažnije transformacije:
• x₁² + x₂² = ² - 2x₁x₂
• 1/x₁ + 1/x₂ = /(x₁x₂)
✅ Test strategija: Uvek prvo identifikuj a, b, c, zatim pažljivo primeni formule - i ne zaboravi minus kod zbira!
Sa ovim znanjem možeš brzo i efikasno da rešavaš zadatke sa kvadratnim jednačinama bez dugotrajnih kalkulacija.
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user