For the function f(x)=2x+8, evaluate and simplify the difference quotient

Answer 1

Some elaboration on what you've done on your own already would be nice, otherwise we can't really do much beyond giving you the straight answer.

The difference quotient, as you may or may not know, is defined as the fraction

( f(x+h) - f(x) ) / h.

What is it you're having trouble with, or having trouble understanding?