Answer
$9(x+2)(3x^2+4)$
Work Step by Step
Use the cubic formula, we have:
$64+(3x+2)^3=(3x+2)^3+4^3=(3x+2+4)[(3x+2)^2-(3x+2)(4)+16]=(3x+6)(9x^2+12)=9(x+2)(3x^2+4)$
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