Posted by **sara** on Wednesday, March 26, 2008 at 9:12pm.

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

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