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We are finding critical numbers

f(x)= 8x^3+x^2+8x

f'(x)=24x^2+2x+8 -> 2(12x^2+x+4)

I'm honestly stuck. All I can tell is that I need to set my f'(x)=0, but I am lost there too.

Quadratic form. equates to (-1±i√191)/24 I believe. That is as far as I can get.

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