If f(x)=-x^2+2x, find [f(x+h)-f(x)]/h, 'h' cannot = 0?

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f(x+h)=-(x^2+2hx+h^2)+2x+2h. Subtract -x^2+2x: -h(2x+h)+2h and divide by h=-(2x+h)+2=2-2x-h.
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