Answer
$x(x-2)(x+2)$
Work Step by Step
$ x^{3}-4x\qquad$...factor out the GCF, $x$.
$=x(x^{2}-4)\qquad$...recognize the difference of two squares: $a^{2}-b^{2}=(a-b)(a+b)$
$=x(x-2)(x+2)$
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