f(x+h) = 3(x+h)^2 + 10(x+h) – 3 = 3(x^2 + h^2 + 2xh) + 10(x+h) - 3 = 3x^2 + 3h^2 + 6xh +10x + 10h – 3
f(x) = 3x^2 + 10x – 3
f(x+h)- f(x) = 3x^2 + 3h^2 + 6xh +10x + 10h – 3 – (3x^2 + 10x – 3) = 6hx + 3h^2 + 10h
[f(x+h)-f(x)]/h = [6hx + 3h^2 + 10h]/h = 6x + 10 + 3h
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f(x+h) = 3(x+h)^2 + 10(x+h) – 3 = 3(x^2 + h^2 + 2xh) + 10(x+h) - 3 = 3x^2 + 3h^2 + 6xh +10x + 10h – 3
f(x) = 3x^2 + 10x – 3
f(x+h)- f(x) = 3x^2 + 3h^2 + 6xh +10x + 10h – 3 – (3x^2 + 10x – 3) = 6hx + 3h^2 + 10h
[f(x+h)-f(x)]/h = [6hx + 3h^2 + 10h]/h = 6x + 10 + 3h