\frac{f(x+h) - f(x)}{h} = \frac{(-3h^2 - 6hx - 3x^2 - 3h - 3x - 7) - (-3x^2 - 6x - 7)}{h}
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$\frac{f(x+h)-f(x)}{h} = \frac{-3h^2 - whx - 3x^2 - 3h - 3x - 7 + 3x^2 + 3x + 7}{h}$ Show more…
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