Question

Can someone tell me if I did this the right way? It seemed easy but it makes me worried that I did it wrong.

h is not equal to 0
f(x)=7x-9
f(x+h)-f(x)/h=
7(x+h)-9-(7x-9)/h=
7x+7h-9-7x+9/h=
7h/h=
7

Answer 1

It is correct. I assume you are supposed to be doing limits, but in this case limitof h/h as h approaches zero is 1.

Answer 2

Thank-you.