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Posted by **sharday** on Friday, May 24, 2013 at 10:02am.

a) from -8 to -2

b) from -1 to 1

c) from 1 to 4

a) what is averge rate of change of f (x) =x^3-9x+9 from -8 to -2?

- algebra -
**Reiny**, Friday, May 24, 2013 at 11:15amI will do a) , you do the others in the same way

f(x) = x^3 - 9x + 9

f(-2) = -8 + 18 + 9 = 19

f(-8) = -512 + 72 + 9 = -431

avg rate of change

= (f(-2) - f(-8) )/(-2 - (-8))

= (19 - (-431))/(-2 - (-8))

=450/6

= 75

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