Answer
$x^3+2x^2-16x+3$
Work Step by Step
$(x-3)(x^2+5x-1)=x(x^2+5x-1)-3(x^2+5x-1)$
$x^3+5x^2-1x-3x^2-15x+3=x^3+2x^2-16x+3$
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