3 3 interpret rates of change of quadratic functions p 69 l.
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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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vocabulary
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 ______)

slide3
goal

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

ex 1 identify intervals of increase decrease
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
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
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 change8
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
Ex. 3: Compare Average Rates of Change

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