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

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

3. 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.

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

5. Example 3, page520

6. Assignment
Page 521 Problems even, 48, 56, 58, 67