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INSTRUCTORS Carleen Eaton Grant Fraser Eric Smith
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For more information, please see full course syllabus of Algebra 1
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Lecture Comments (3)

2 answers

Last reply by: julius mogyorossy
Mon Sep 19, 2011 6:19 PM

Post by Yves Langlois on February 24, 2011

Why can't I do examples 3 & 4, it says there is a network failure,yet I am still logged on to the Educator site?

Graphing Quadratic Functions

  • A quadratic function is a function of the form f(x) = ax2 + bx + c, where a ≠ 0. This is called the standard form of a quadratic function.

  • The graph of a quadratic function is a parabola. If a > 0, the parabola opens upward. If a < 0, it opens downward.

  • The axis of symmetry divides a parabola into two symmetrical halves. Its equation is x = -b/2a.

  • Use the axis of symmetry to help you graph a parabola. Graph the right or left half and then reflect the graph across the axis of symmetry.

  • The maximum or minimum value of the graph occurs at the vertex. The formula for the x-coordinate of the vertex is x = -b/2a. Use this formula to find the maximum or minimum.

Graphing Quadratic Functions

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Parabolas 0:09
  • Parabolas That Open Upward 3:58
    • Minimum
  • Parabolas That Open Downward 4:54
    • Maximum
  • Vertex 7:28
    • Example
  • Axis of Symmetry 11:03
  • Lecture Example 1 13:27
  • Lecture Example 2 17:17
  • Additional Example 3
  • Additional Example 4