Answer
$x^3+3x^2+3x+1$
Work Step by Step
RECALL:
$(a+b)^3=a^3++3a^2b+ 3ab^2+b^3$
Use the formula above with $a=x$ and $b=1$ to obtain:
$=x^3+3(x^2)(1)+3(x)(1^2)+1^3
\\=x^3+3x^2+3x+1$
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