Answer
$39x^{3}+13x^{2}+3x+1$
Work Step by Step
$(13x^{2}+1)(3x+1)$
Multiplying binomial by binomial using FOIL Order.
$13x^{2}(3x)+13x^{2}(1)+1(3x)+1(1)$
$=39x^{3}+13x^{2}+3x+1$
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