Algebra I Section 9.3 Graph Quadratic Functions

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Presentation transcript:

Algebra I Section 9.3 Graph Quadratic Functions Recall: The graph of the linear function y = mx + b is a line. m>0 m<0 A Quadratic Function takes the form: y = ax2 + bx + c

Graph the quadratic function y = x2 Graph y = -1x2

The graph of a quadratic function y = ax2 + bx + c is called a parabola. If a>0, the parabola opens up. If a<0, the parabola opens down. The x value of the vertex is given by x = -b/2a The equation of the axis of symmetry is x = -b/2a The y intercept is c.

Find the vertex, the equation of the axis of symmetry, and graph the function. y = 5x2 + 10x - 7 y = -x2 + 8x - 4

Example 3, page520

Assignment Page 521 Problems 32-40 even, 48, 56, 58, 67