Completing the Square and Finding x Intercepts

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Taught by mrbrianmclogan
  • Currently 3.0/5 Stars.
4801 views | 1 rating
Part of video series
Meets NCTM Standards:
Errors in this video:

At about the 6:55 mark, the teacher says -1+2 is -1; he should have said that -1+2 is 1.

Lesson Summary:

In this lesson, we learn about completing the square and finding the x-intercepts of a quadratic equation. Completing the square allows us to put the equation in standard form, making it easier to identify the vertex and find the x-intercepts using the quadratic formula. By demonstrating step-by-step how to complete the square, the teacher shows how to rewrite the equation in a binomial squared form, making it easier to factor and find the zeros of the function.

Lesson Description:

Completing the square and finding the x intercepts

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 complete the square?
  • How do I find the zeros of a polynomial by completing the square?
  • How do I complete the square for the function f(x)=x^2+2x-3?
  • What are the zeros of the function f(x)=x^2+2x-3?
  • Staff Review

    • Currently 3.0/5 Stars.
    This lesson gives an example of how to complete the square when you are given a quadratic function. Then it shows how to find the zeros of the function once you have completed the square.