Answer
$$27x^3-54x^2+36x-8$$
Work Step by Step
Multiplying the equation out, we find:
$$\left(3x\right)^3-3\left(3x\right)^2\cdot \:2+3\cdot \:3x\cdot \:2^2-2^3\\ 27x^3-54x^2+36x-8$$
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