Subjects

Careers

Open the App

Subjects

How to Solve Quadratic Equations: Easy Examples and Fun Math Tips!

Open

0

0

user profile picture

Miranda M.

6/20/2023

Algebra 2

Algebra 2 Quadratics Notes

Subjects

/

Algebra 2

/

Complex Numbers & Unit I

/

The Imaginary Unit I

How to Solve Quadratic Equations: Easy Examples and Fun Math Tips!

Quadratic functions and equations are fundamental concepts in algebra, covering topics from solving equations to graphing parabolas. This comprehensive guide explores various aspects of quadratic functions, including how to solve quadratic equations with examples, understanding the discriminant in quadratic functions, and a dividing complex numbers step by step guide.

Key points:
• Quadratic equations can be solved using factoring, completing the square, or the quadratic formula
• The discriminant determines the nature of a quadratic equation's roots
• Complex numbers and operations, including division, are essential for handling certain quadratic equations
• Graphing quadratic functions involves identifying key points such as the vertex, x-intercepts, and y-intercept
• Special forms like vertex form and the equation of a circle are related to quadratic expressions

...

6/20/2023

40

Quadratic Function Exam Review - Quadratic Equation Rules: up = *Vertex • Must be set = 0 * Parabola facing down. =max& = min. * Cannot divi

View

Imaginary and Complex Numbers

This page delves into imaginary and complex numbers, providing definitions and examples of operations involving these numbers. It covers the fundamental concept that i² = -1 and how this applies to various calculations.

Vocabulary: Complex numbers are numbers in the form a + bi, where a is the real part and b is the imaginary part.

The page includes examples of simplifying expressions with imaginary numbers and performing operations with complex numbers. It also introduces the concepts of rational and irrational numbers.

Example: The page demonstrates how to simplify expressions like (5i)⁴, breaking it down step-by-step to arrive at the solution 625.

Highlight: When working with powers of i, remember that the pattern repeats every four powers: i¹ = i, i² = -1, i³ = -i, i⁴ = 1.

Quadratic Function Exam Review - Quadratic Equation Rules: up = *Vertex • Must be set = 0 * Parabola facing down. =max& = min. * Cannot divi

View

Dividing Complex Numbers

This page focuses on the process of dividing complex numbers, which is a crucial skill in understanding the discriminant in quadratic functions. It explains the use of conjugates and provides step-by-step examples.

Definition: The conjugate of a complex number a + bi is a - bi. Multiplying a complex number by its conjugate eliminates the imaginary part in the denominator.

The page covers important concepts such as multiplicative inverse, additive inverse, and conjugates. It provides detailed examples of how to divide complex numbers and simplify the results.

Example: To divide 4 - 3i by 1 - 2i, multiply both numerator and denominator by the conjugate of the denominator: (4 - 3i)(1 + 2i) / (1 - 2i)(1 + 2i).

Highlight: When dividing complex numbers, always multiply both the numerator and denominator by the conjugate of the denominator to rationalize the denominator.

Quadratic Function Exam Review - Quadratic Equation Rules: up = *Vertex • Must be set = 0 * Parabola facing down. =max& = min. * Cannot divi

View

Using the Discriminant

This page explains the concept of the discriminant in quadratic equations and how it can be used to determine the nature of the roots. The discriminant is given by the formula b² - 4ac for a quadratic equation in the form ax² + bx + c = 0.

Definition: The discriminant is a value that helps determine the nature of the roots of a quadratic equation without actually solving the equation.

The page provides a breakdown of what different discriminant values mean:

  • Perfect square (positive): Two different real, rational roots
  • Positive, not a perfect square: Two different real, irrational roots
  • Zero: One real, rational root (double root)
  • Negative: Two imaginary roots

Example: For the equation 2x² + 5x - 3 = 0, the discriminant is calculated as 5² - 4(2)(-3) = 49, indicating two real, rational roots.

Highlight: The discriminant is a powerful tool for quickly determining the nature of a quadratic equation's solutions without solving the equation completely.

Quadratic Function Exam Review - Quadratic Equation Rules: up = *Vertex • Must be set = 0 * Parabola facing down. =max& = min. * Cannot divi

View

The Discriminant and Completing the Square

This page continues the discussion on the discriminant and introduces the method of completing the square. It provides examples of using the discriminant to analyze quadratic equations and demonstrates how to complete the square to solve equations and find the vertex of parabolas.

Example: The page shows how to complete the square for the equation x² + 14x = 45, resulting in (x + 7)² = 94, which can then be solved to find the roots.

The page also covers how to use the discriminant to determine when an equation will have imaginary roots. It includes an example of finding the range of values that make a quadratic equation have imaginary roots.

Highlight: Completing the square is not only useful for solving quadratic equations but also for converting quadratic functions into vertex form, which makes it easier to identify the vertex and axis of symmetry.

Quadratic Function Exam Review - Quadratic Equation Rules: up = *Vertex • Must be set = 0 * Parabola facing down. =max& = min. * Cannot divi

View

Equation of Circles and Vertex Form of Parabolas

This final page covers two important topics: the equation of circles and the vertex form of parabolas. It provides the general form of a circle equation and explains how to identify the center and radius from the equation.

Definition: The general form of a circle equation is (x - h)² + (y - k)² = r², where (h, k) is the center and r is the radius.

The page also discusses the vertex form of parabolas for both vertical and horizontal orientations. It explains how to interpret the coefficients in these forms to determine the direction of opening and the location of the vertex.

Example: For the parabola equation (x + 1)² = -8(y - 4), the page demonstrates how to identify the vertex, axis of symmetry, directrix, and focus.

Highlight: Understanding the vertex form of parabolas is crucial for quickly identifying key features of the graph, such as the vertex, direction of opening, and axis of symmetry.

Similar Content

Know Absonsulte Values and Absolute Inequalities Notes thumbnail

21

271

9th/10th

Absonsulte Values and Absolute Inequalities Notes

Solving and writing absolute values

Know Algebra II 90s (FIRST SEMESTER) thumbnail

1

77

10th

Algebra II 90s (FIRST SEMESTER)

Good luck 🍀 Ask questions in the comments!

Can't find what you're looking for? Explore other subjects.

Knowunity is the # 1 ranked education app in five European countries

Knowunity was a featured story by Apple and has consistently topped the app store charts within the education category in Germany, Italy, Poland, Switzerland and United Kingdom. Join Knowunity today and help millions of students around the world.

Ranked #1 Education App

Download in

Google Play

Download in

App Store

Knowunity is the # 1 ranked education app in five European countries

4.9+

Average App Rating

21 M

Students use Knowunity

#1

In Education App Charts in 17 Countries

950 K+

Students uploaded study notes

Still not sure? Look at what your fellow peers are saying...

iOS User

I love this app so much [...] I recommend Knowunity to everyone!!! I went from a C to an A with it :D

Stefan S, iOS User

The application is very simple and well designed. So far I have found what I was looking for :D

SuSSan, iOS User

Love this App ❤️, I use it basically all the time whenever I'm studying

Subjects

Algebra 2

Complex Numbers & Unit I

The Imaginary Unit I

 

Algebra 2

•

40

•

Jun 20, 2023

•

6 pages

How to Solve Quadratic Equations: Easy Examples and Fun Math Tips!

user profile picture

Miranda M.

@scarmira1

Quadratic functions and equations are fundamental concepts in algebra, covering topics from solving equations to graphing parabolas. This comprehensive guide explores various aspects of quadratic functions, including how to solve quadratic equations with examples, understanding the discriminant in quadratic

... Show more
Quadratic Function Exam Review - Quadratic Equation Rules: up = *Vertex • Must be set = 0 * Parabola facing down. =max& = min. * Cannot divi

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Imaginary and Complex Numbers

This page delves into imaginary and complex numbers, providing definitions and examples of operations involving these numbers. It covers the fundamental concept that i² = -1 and how this applies to various calculations.

Vocabulary: Complex numbers are numbers in the form a + bi, where a is the real part and b is the imaginary part.

The page includes examples of simplifying expressions with imaginary numbers and performing operations with complex numbers. It also introduces the concepts of rational and irrational numbers.

Example: The page demonstrates how to simplify expressions like (5i)⁴, breaking it down step-by-step to arrive at the solution 625.

Highlight: When working with powers of i, remember that the pattern repeats every four powers: i¹ = i, i² = -1, i³ = -i, i⁴ = 1.

Quadratic Function Exam Review - Quadratic Equation Rules: up = *Vertex • Must be set = 0 * Parabola facing down. =max& = min. * Cannot divi

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Dividing Complex Numbers

This page focuses on the process of dividing complex numbers, which is a crucial skill in understanding the discriminant in quadratic functions. It explains the use of conjugates and provides step-by-step examples.

Definition: The conjugate of a complex number a + bi is a - bi. Multiplying a complex number by its conjugate eliminates the imaginary part in the denominator.

The page covers important concepts such as multiplicative inverse, additive inverse, and conjugates. It provides detailed examples of how to divide complex numbers and simplify the results.

Example: To divide 4 - 3i by 1 - 2i, multiply both numerator and denominator by the conjugate of the denominator: (4 - 3i)(1 + 2i) / (1 - 2i)(1 + 2i).

Highlight: When dividing complex numbers, always multiply both the numerator and denominator by the conjugate of the denominator to rationalize the denominator.

Quadratic Function Exam Review - Quadratic Equation Rules: up = *Vertex • Must be set = 0 * Parabola facing down. =max& = min. * Cannot divi

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Using the Discriminant

This page explains the concept of the discriminant in quadratic equations and how it can be used to determine the nature of the roots. The discriminant is given by the formula b² - 4ac for a quadratic equation in the form ax² + bx + c = 0.

Definition: The discriminant is a value that helps determine the nature of the roots of a quadratic equation without actually solving the equation.

The page provides a breakdown of what different discriminant values mean:

  • Perfect square (positive): Two different real, rational roots
  • Positive, not a perfect square: Two different real, irrational roots
  • Zero: One real, rational root (double root)
  • Negative: Two imaginary roots

Example: For the equation 2x² + 5x - 3 = 0, the discriminant is calculated as 5² - 4(2)(-3) = 49, indicating two real, rational roots.

Highlight: The discriminant is a powerful tool for quickly determining the nature of a quadratic equation's solutions without solving the equation completely.

Quadratic Function Exam Review - Quadratic Equation Rules: up = *Vertex • Must be set = 0 * Parabola facing down. =max& = min. * Cannot divi

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

The Discriminant and Completing the Square

This page continues the discussion on the discriminant and introduces the method of completing the square. It provides examples of using the discriminant to analyze quadratic equations and demonstrates how to complete the square to solve equations and find the vertex of parabolas.

Example: The page shows how to complete the square for the equation x² + 14x = 45, resulting in (x + 7)² = 94, which can then be solved to find the roots.

The page also covers how to use the discriminant to determine when an equation will have imaginary roots. It includes an example of finding the range of values that make a quadratic equation have imaginary roots.

Highlight: Completing the square is not only useful for solving quadratic equations but also for converting quadratic functions into vertex form, which makes it easier to identify the vertex and axis of symmetry.

Quadratic Function Exam Review - Quadratic Equation Rules: up = *Vertex • Must be set = 0 * Parabola facing down. =max& = min. * Cannot divi

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Equation of Circles and Vertex Form of Parabolas

This final page covers two important topics: the equation of circles and the vertex form of parabolas. It provides the general form of a circle equation and explains how to identify the center and radius from the equation.

Definition: The general form of a circle equation is (x - h)² + (y - k)² = r², where (h, k) is the center and r is the radius.

The page also discusses the vertex form of parabolas for both vertical and horizontal orientations. It explains how to interpret the coefficients in these forms to determine the direction of opening and the location of the vertex.

Example: For the parabola equation (x + 1)² = -8(y - 4), the page demonstrates how to identify the vertex, axis of symmetry, directrix, and focus.

Highlight: Understanding the vertex form of parabolas is crucial for quickly identifying key features of the graph, such as the vertex, direction of opening, and axis of symmetry.

Quadratic Function Exam Review - Quadratic Equation Rules: up = *Vertex • Must be set = 0 * Parabola facing down. =max& = min. * Cannot divi

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Quadratic Function Exam Review

This page introduces key concepts for solving quadratic equations and graphing quadratic functions. It covers the fundamental theorem of quadratics, rules for solving equations, and methods for graphing.

Definition: The fundamental theorem of quadratics states that you have as many answers as the greatest roots.

Example: For solving quadratic equations, the page provides examples such as 3k² = 8k - 4, demonstrating the step-by-step process to find solutions.

The page also explains how to graph quadratic equations, including finding the axis of symmetry, vertex, y-intercept, and x-intercepts. It emphasizes the importance of understanding whether the parabola opens upward or downward based on the sign of the leading coefficient.

Highlight: When graphing quadratic equations, pay attention to the sign of the leading coefficient to determine if the parabola opens upward (positive) or downward (negative).

Similar Content

Algebra II 90s (FIRST SEMESTER)

77

1

More

Can't find what you're looking for? Explore other subjects.

Students love us — and so will you.

4.9/5

App Store

4.8/5

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 THE SCHOOLGPT. 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 THE SCHOOLGPT. 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