Evaluate
3x\left(x-1\right)\left(3x+1\right)
Expand
9x^{3}-6x^{2}-3x
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\left(9x^{2}+3x\right)\left(x-1\right)
Use the distributive property to multiply -3x by -3x-1.
9x^{3}-9x^{2}+3x^{2}-3x
Apply the distributive property by multiplying each term of 9x^{2}+3x by each term of x-1.
9x^{3}-6x^{2}-3x
Combine -9x^{2} and 3x^{2} to get -6x^{2}.
\left(9x^{2}+3x\right)\left(x-1\right)
Use the distributive property to multiply -3x by -3x-1.
9x^{3}-9x^{2}+3x^{2}-3x
Apply the distributive property by multiplying each term of 9x^{2}+3x by each term of x-1.
9x^{3}-6x^{2}-3x
Combine -9x^{2} and 3x^{2} to get -6x^{2}.
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