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What is f(-x)?

The question didn't say and so I'm stuck.

\(f(-x)\) is confusing, but it means replace \(x\) everywhere by \(-x\)

So it would be -x-x-9-(x^2+x-9)?

i assume you mean
\[-x^3-x-9-(x^3+x-9)\]

Yes.

ok good, now remove the parentheses by distributing the minus sign, then combine like terms

Thank you!

yw hope it is clear