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algebra

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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

  • algebra -

    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 -

    Thank-you.

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