Evaluate
\left(3x-2\right)\left(3x^{2}+4\right)
Expand
9x^{3}-6x^{2}+12x-8
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x^{3}-6x^{2}+12x-8+8x^{3}
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(x-2\right)^{3}.
9x^{3}-6x^{2}+12x-8
Combine x^{3} and 8x^{3} to get 9x^{3}.
x^{3}-6x^{2}+12x-8+8x^{3}
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(x-2\right)^{3}.
9x^{3}-6x^{2}+12x-8
Combine x^{3} and 8x^{3} to get 9x^{3}.
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