Posted by sara on .
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)=7x9
f(x+h)f(x)/h=
7(x+h)9(7x9)/h=
7x+7h97x+9/h=
7h/h=
7

algebra 
bobpursley,
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.

algebra 
Anonymous,
Thankyou.