Given (x)=-x²+2x, determine
f'(x) using first principle

Hello,
which principle?

f(x)=-x²+2x
==>f'(x)= -2x+2

You mean maybe this



f(x+h)=-(x+h)²+2(x+h)= -(x²+2hx+h²)+2x+2h
f(x)=-x²+2x

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