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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 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
Guided Practice p. 69 #1, 2, 4, 6 1) 2) 4) 6)
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 .