Posted by **ladybug** on Thursday, September 20, 2012 at 4:48am.

For the function f(x)= 8/x+7,find the average rate of change of f from 1 to x.

- pre-calculus--Please help, urgent. -
**Reiny**, Thursday, September 20, 2012 at 8:48am
Did you mean

f(x) = 8/(x+7)

then f(1) = 8/8 = 1

avg rate of change = (f(x) - f(1) )/(x-1)

= (8/(x+7) - 1)/(x-1)

= ( (8 - x - 7)/(x+7) )/(x-1)

= ( (1-x)/x+7) )/(x-1)

= -1/(x+7)

- pre-calculus--Please help, urgent. -
**ladybug**, Thursday, September 20, 2012 at 9:10am
thank you so much!!

- pre-calculus--Please help, urgent. -
**Reiny**, Thursday, September 20, 2012 at 9:16am
You are welcome.

(I have just answered 13 questions this morning, and you are the only one to say thank you or acknowledge the answer, much appreciated)

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