Algebra
posted by Bonnie on .
Please Find the difference quotient
f(x+h)fx/h for f(x)= 4x9 and simplify

put x+h in f(x) to get 4x+4h9
then subtract 4x+9 then divide by h 
This is what I got, is it correct? Thanks!
4x+4h9+ (4x+9)/h
4x4x= 4h9+9/h
= 4h/h
=4 
Your answer is correct, but it is preferable to place parentheses where they are needed to avoid ambiguity, for example:
(4x+4h9+ (4x+9))/h
(4x4x + 4h9+9)/h
= 4h/h
=4