(a) $f(-x)=3x^4+2x$ (b) $-f(x)=-3x^4+2x$
Work Step by Step
(a) Replace $x$ with $-x$ to get $$f(-x)=3(-x)^4-2(-x)=3(-1)^4x^4+2x=3x^4+2x$$ (b) Multiply $f(x)$ by $-1$ to get $-f(x)=-3x^4+2x$.
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