Answer
$(x+1)(x^4+1)$
Work Step by Step
Regroup to obtain:
$=(x^5+x^4)+(x+1)$
Factor out $x^4$ in the first group to obtain:
$=x^4(x+1)+(x+1)$
Factor out the greatest common factor $(x+1)$ to obtain:
$=(x+1)(x^4+1)$
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