Answer
$4 x^4 - 8 x^3 - 20 x^2 + 24 x$
Work Step by Step
$x-c$ is a factor if and only if $c$ is a zero,
We just multiply,
$(x+2)x(x-1)(x-3)$ And multiply by 4,
$4(x+2)x(x-1)(x-3)$
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