Evaluate
6\left(21-x\right)\left(x^{2}+72\right)
Expand
9072-432x+126x^{2}-6x^{3}
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\left(432+6x^{2}\right)\left(21-x\right)
Subtract 9 from 30 to get 21.
9072-432x+126x^{2}-6x^{3}
Use the distributive property to multiply 432+6x^{2} by 21-x.
\left(432+6x^{2}\right)\left(21-x\right)
Subtract 9 from 30 to get 21.
9072-432x+126x^{2}-6x^{3}
Use the distributive property to multiply 432+6x^{2} by 21-x.
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