so let's do that
f(5+h) = 5(5+h) - (5+h)^2
= 25 + 5h - 25 - 10h - h^2
= -5h - h^2
and f(5) = 25 - 25 = 0
so f(5+h)-f(5) over h
= (-5h - h^2 - 0)/h
= -5 - h , if h is not equal to zero
(looks like you are starting to find the derivative of a function from basic principles in an introductory Calculus course, right?)
Find the quotient and simplify your answer.
f(x)=5x-x^2, f(5+h)-f(5) over h
Please help I am so lost! All I know is that you have to put (5+h) wherever there is an x.
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