Asked by Adam

Find the average rate of change for the function between the give values.

f(x)=-4x + 8; from 1 to 2

Answered by Damon
A. evaluate the function at x = 2
B. evaluate the function at x = 1
then
Subtract B from A
divide by the change in x from 1 to 1 which is 2-1 = 1
So the answer is simply
(A-B)
Answered by Adam
The book has the correct answer at -4..how'd they arrive at that?
Answered by Damon
A -4(2)+ 8 = 0
B -4(1)+ 8 = 4
A-B = 0 - 4 = -4
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