Answer
$6x^3+25x^2+10x+1$
Work Step by Step
$(6x+1)(x^2+4x+1)=6x(x^2)+6x(4x)+6x(1)+1(x^2)+1(4x)+1(1)=6x^3+24x^2+6x+x^2+4x+1=6x^3+25x^2+10x+1$
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