2. Main Idea and New Vocabulary Example 1: Graph Quadratic Functions
Example 3: Real-World Example
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3. Graph quadratic functions.
Main Idea/Vocabulary

4. Graph Quadratic Functions
Graph y = 5x2.
To graph a quadratic function, make a table of values, plot the ordered pairs, and connect the points with a smooth curve.
Example 1

5. Graph Quadratic Functions
Answer:
Example 1

6. Graph y = 4x2.
A. C.
B. D.
Example 1 CYP

7. Graph Quadratic Functions
Graph y = –x2 – 2.
Example 2

8. Graph Quadratic Functions
Answer:
Example 2

9. Graph y = –2x2 + 2.
A. C.
B. D.
Example 2 CYP

10. Time cannot be negative, so use only positive values of t.
GRAVITY The equation d = t2 describes the distance d in feet that a stone falls off a cliff during time t. Graph this function. Then use the graph to estimate how long it would take a stone to fall 200 feet.
Time cannot be negative, so use only positive values of t.
Example 3

11. Answer: It would take a stone about 3.5 seconds to fall 200 feet.
Example 3

12. GRAVITY The equation d = –16t describes the distance d in feet that a falling acorn is from the ground at time t seconds. Graph this function. Then use the graph to estimate how long it would take the acorn to hit the ground.
A. about 0.5 second
B. about 1.7 seconds
C. about 16 seconds
D. about 48 seconds
Example 3 CYP