Answer
(a) $f(-x)=2x^2$
(b) $-f(x)=-2x^2$
Work Step by Step
(a) Replace $x$ with $-x$ to get $$f(-x)=2(-x)^2=2(-1)^2(x)^2=2x^2$$ (b) Multiply $f(x)$ by $-1$ to get $-f(x)$, $-2x^2$.
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