Suppose that f (x) is a function such that the relationship given below is true.

Question

f (3 + h) - f (3) = 9h^2 + 8h

(a) What is f '(3)?

(b) What is the slope of the secant line through (3, f (3)) and (7, f (7))?

Please do not use shortcuts(from future chapters) and show steps so i can see whats going on

i tried doing f '(3) = (f(3+h)-f(3))/h and for the function i used 9h^2+8h but that's giving a wrong answer.

Answer 1

Catherine, it is much easier for everyone to follow if you post the followups in the same thread, namely:
http://www.jiskha.com/display.cgi?id=1284506760

I hope you understand.