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3. 3 Interpret Rates of Change of Quadratic Functions p. 69

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3. 3 Interpret Rates of Change of Quadratic Functions p. 69. Vocabulary. rate of change: the speed at which a variable changes over a specific period of time Ex: Cell Phones ( cost per ______) Cars (miles per ______). goal.

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## 3. 3 Interpret Rates of Change of Quadratic Functions p. 69

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### 3.3 Interpret Rates of Change of Quadratic Functionsp. 69

Vocabulary

rate of change: the speed at which a variable changes over a specific period of time

Ex: Cell Phones ( cost per ______)

Cars (miles per ______)

goal

Use intervals of increase and decrease to understand average rates of change of quadratic functions.

Ex. 1: Identify Intervals of Increase & Decrease
• Graph the function. Identify the intervals over which the graph increases and decreases.

a) y = x2 + 3x – 4 b) y = -1/2 (x – 2)2 + 1

Today’s Classwork…
• P. 72 #’s 1-7 ALL
• #’s 1-4 are the only ones you graph
Ex. 2: Calculate an Average Rate of Change

Calculate the average rate of change of the function y = -0.5x2 + 4 on the given interval.

a)

b)

Ex. 2: Calculate an Average Rate of Change

Calculate the average rate of change of the function y = -0.5x2 + 4 on the given interval.

c)

Ex. 3: Compare Average Rates of Change

Compare the average rates of change of y = x2 and y = x on .