Posted by Devin on Thursday, November 29, 2012 at 3:03pm.
f(a+h) = (a+h)^2 + 5(a+h) - 10
f(a) = a^2 + 5a - 10
(f(a+h)-f(a))/h
= (a^2 + 2ah + h^2 + 5a + 5h - 10 - a^2 - 5a + 10)/h
= (2ah + h^2)/h
= 2a + h
oops
(2ah + 5h + h^2)/h
= 2a + 5
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