Finding Irrational Roots with the Quadratic Formula

Sick of ads?‚Äč Sign up for MathVids Premium
Taught by mrbrianmclogan
  • Currently 4.0/5 Stars.
6687 views | 1 rating
Part of video series
Meets NCTM Standards:
Lesson Summary:

In this lesson, we learn how to use the quadratic formula to find real irrational roots when factoring is not possible. We are reminded to first identify the values of A, B, and C in the quadratic formula, and then evaluate the discriminant to determine whether the roots will be real or complex. If the discriminant is not a square number, we know that the roots will be irrational. We also learn a helpful technique for simplifying the radical in our final answer. Overall, the quadratic formula is a powerful tool that can help us solve even the most challenging quadratic equations.

Lesson Description:

How to factor using the quadratic formula finding real irrational roots

I show how to solve math problems online during live instruction in class. This is my way of providing free tutoring for the students in my class and for students anywhere in the world. Every video is a short clip that shows exactly how to solve math problems step by step. The problems are done in real time and in front of a regular classroom. These videos are intended to help you learn how to solve math problems, review how to solve a math problems, study for a test, or finish your homework. I post all of my videos on YouTube, but if you are looking for other ways to interact with me and my videos you can follow me on the following pages through My Blog, Twitter, or Facebook.

Questions answered by this video:
  • How do I solve a quadratic equation using the quadratic formula?
  • How do I simplify the irrational solutions after using the quadratic formula?
  • Staff Review

    • Currently 4.0/5 Stars.
    This video shows how to solve a quadratic equation using the quadratic formula. After solving the equation, the instructor demonstrates how to simplify the irrational solutions.