$$4x- { x }^{ 3 }$$
$x\left(-x-2\right)\left(x-2\right)$
$$x\left(4-x^{2}\right)$$
$$\left(2-x\right)\left(2+x\right)$$
$$\left(-x+2\right)\left(x+2\right)$$
$$x\left(-x+2\right)\left(x+2\right)$$
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$x\left(4-x^{2}\right)$