Completing the Square of Two Functions

Sick of ads?​ Sign up for MathVids Premium
Taught by mrbrianmclogan
  • Currently 4.0/5 Stars.
4763 views | 1 rating
Part of video series
Meets NCTM Standards:
Lesson Summary:

This lesson teaches how to complete the square of a function in order to get it into standard form and find the vertex of a parabola. By factoring out negative one and adding a perfect square, the equation transforms into a standard form by getting the perfect square in the parentheses. The lesson also shows how to find the values for x by plugging f of x equal to zero and then solving.

Lesson Description:

Completing the square of two functions

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 quadratic function?
  • How do I complete the square for the function f(x)=x^2+6x+8?
  • How do I complete the square for the function f(x)=-x^2+2x+5?
  • What are the zeros of the function f(x)=x^2+6x+8?
  • Staff Review

    • Currently 4.0/5 Stars.
    This lesson gives two examples of completing the square. On one of the functions, the teacher goes on to show how to find the zeros of the function once you have completed the square.