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Published byRodger Melton Modified over 5 years ago

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Graphing Quadratic Functions – Concept A quadratic function in what we will call Standard Form is given by: The graph of a quadratic function is called a parabola. Here is the graph of a very simple quadratic function:

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The value of the coefficient a determines the direction the parabola faces. When the value of a is positive, the parabola faces up. When the value of a is negative, the parabola faces down.

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Example 1: Face Up Face Down

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The value of the coefficient a also determines the shape of the parabola. When | a | > 1 the parabola is narrow. When 0 < | a | < 1 the parabola is wide.

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Example 2: Narrow Wide

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The vertex of a parabola is the highest point or the lowest point on the graph of a parabola. Vertex

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The vertex of a parabola whose function is given in standard form … … is given by V(h,k). Example 3: The vertex is given by:

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Example 3: The vertex is given by: Put the function in the form of …

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The vertex is given by: Here is an easier way to work the last problem: For the h value, take the opposite sign … For the k value, take the same sign …

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Example 4: The vertex is given by:

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The axis of symmetry of a parabola is the vertical line going through the vertex. Notice the symmetry of the two branches of the parabola about the axis. Example 5: Draw the axis

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The equation of the axis of symmetry is given by where h is the x-value of the vertex. In this case, the equation of the axis of symmetry is given by:

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SUMMARY Face Up Face Down Narrow Wide Vertex Axis of symmetry

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