Answer
$(x-1)(x^2-5)$
Work Step by Step
Regroup to obtain
$(x^3-x^2)+(-5x+5.)$
Factor out $x^2$ in the first group and $-5$ in the second:
$x^2(x-1)+(-5)(x-1)
\\=x^2(x-1)-5(x-1).$
Factor out $(x-1)$ to obtain
$(x-1)(x^2-5).$