Work Step by Step
RECALL: $(a+b)^3=a^3++3a^2b+ 3ab^2+b^3$ Use the formula above with $a=3x$ and $b=4$ to obtain: $=(3x)^3+3(3x)^2(4)+3(3x)(4^2)+4^3 \\=27x^3+12(9x^2)+9x(16)+64 \\=27x^3+108x^2+144x+64$
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