Question 771766
(s)=9s^2 minus 7s; f(5+h)-f(5)divided by h. h cannot be zero

 f(5+h)=9(5+h)^2 -7(5+h) = 9(h^2+10h+25)-7h-35 =9h^2+83h+190

f(5) = 9(5^2)-7(5)  = 190

Then
(f(5+h)-f(5))/h = (9h^2+83h)/h  = 9h+83

Answer:  9h+83

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