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Start by taking the derivative of your function. That will be your first step. Can you do that?

9+(2/x^2)=0?

Great. Now that you have that, solve for "x".

how is it wrong?

9+(2x^(-2))=0?

no

\[9x+2x^{-1}\]\[9+(-1)2x^{-1-1}\]\[9-2x^{-2}\]\[9-2/x^2\]

oh not plus ok. I see

next step is mutiply x^2 both side?

\[9-2/x^2=0\]\[9=2/x^2\]\[x^2=2/9\]\[x=+/-(\sqrt2/3)\]

Ops sorry i did 9X^2+2=0

Yea, I do need to prepare derivative problems.
Are you going?