Completing the Square by Factoring Out a Two

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Taught by mrbrianmclogan
  • Currently 3.0/5 Stars.
4667 views | 1 rating
Part of video series
Meets NCTM Standards:
Errors in this video:

At about the 1:18 mark, the teacher writes on the board that b/2 is (1/2)/2, but he should have written (-1/2)/2.

At about the 2:22 mark, the teacher writes that b/2=1/4; he should have written b/2=-1/4

Lesson Description:

Completing the square by factoring out a two

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Questions answered by this video:
  • How do I complete the square when there is a coefficient in front of the x^2 term?
  • How do I find the vertex of a quadratic function that is written in ax^2+bx+c form?
  • How do I find the zeros of a quadratic function?
  • How do I complete the square for the function 2x^2-x+1?
  • What is the vertex of 2x^2-x+1?
  • What are the zeros of 2x^2-x+1?
  • Staff Review

    • Currently 3.0/5 Stars.
    This lesson shows how to complete the square on a quadratic function when the x^2 term has a coefficient. Then it shows how to find the vertex of the parabola that the function represents. Lastly, it shows how to find the zeros of the function after you complete the square.