1. On the same graph
Graph f(x) = x 2 Graph f(x) = ­ x2

3. y = x2 y = ­x2

5. y =
1
y =

7. In general the following statements are true for each
quadratic function of the type y = ax2:
1. Axis of symmetry is the y­axis, its equation is x = 0.
2. Coordinates of the vertex are (0, 0).
3. If graph opens upward.
If , graph opens downward
4. If , graph is narrower than y = x2 (stretch)
If , graph is wider than y = x2 (shrunk)
5. If a > 0, the minimum value of y is 0.
If a < 0, the maximum value of y is 0.

8. Exercise 2
Omit #9, and #10