Evaluate
x\left(12x^{2}+9x-8\right)
Expand
12x^{3}+9x^{2}-8x
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6x^{3}+6x^{2}-8x+x^{2}\left(6x+3\right)
Use the distributive property to multiply 2x by 3x^{2}+3x-4.
6x^{3}+6x^{2}-8x+6x^{3}+3x^{2}
Use the distributive property to multiply x^{2} by 6x+3.
12x^{3}+6x^{2}-8x+3x^{2}
Combine 6x^{3} and 6x^{3} to get 12x^{3}.
12x^{3}+9x^{2}-8x
Combine 6x^{2} and 3x^{2} to get 9x^{2}.
6x^{3}+6x^{2}-8x+x^{2}\left(6x+3\right)
Use the distributive property to multiply 2x by 3x^{2}+3x-4.
6x^{3}+6x^{2}-8x+6x^{3}+3x^{2}
Use the distributive property to multiply x^{2} by 6x+3.
12x^{3}+6x^{2}-8x+3x^{2}
Combine 6x^{3} and 6x^{3} to get 12x^{3}.
12x^{3}+9x^{2}-8x
Combine 6x^{2} and 3x^{2} to get 9x^{2}.
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