Answer
(a) $-x^2-2xh-h^2$
(b) $-2xh-h^2$
(c) $-2x-h$
Work Step by Step
(a) Given $f(x)=-x^2$, we have $f(x+h)=-(x+h)^2=-x^2-2xh-h^2$
(b) $f(x+h)-f(x)=-(x+h)^2+x^2=-2xh-h^2$
(c) $\frac{f(x+h)-f(x)}{h}=-2x-h$
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