Evaluate
x\left(30x^{3}+40x-81\right)
Factor
x\left(30x^{3}+40x-81\right)
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4x^{2}-81x+30x^{4}+36x^{2}
The opposite of -30x^{4} is 30x^{4}.
40x^{2}-81x+30x^{4}
Combine 4x^{2} and 36x^{2} to get 40x^{2}.
x\left(4x-81+30x^{3}+36x\right)
Factor out x. Polynomial 30x^{3}+40x-81 is not factored since it does not have any rational roots.
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