Answer
$x ( 1 - x) (1+x) ( 1 + x^2)$
Work Step by Step
$x - x^5 = x ( 1 - x^4 ) = x ( (1)^2 - (x^2 ) ^2 ) = x ( 1 - x^2) ( 1 + x^2) = x ( (1)^2 - (x)^2) ( 1 + x^2) = x ( 1 - x) (1+x) ( 1 + x^2)$
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