Factors of
−x3−125
(x+5)(x2−5x+25)
−1(x+5)(x2−5x+25)
(x−5)(x2+5x−25)
−1(x−5)(−x2−5x+25)
Take −1 common from the expression, we get
−1(x3+125)
=−1(x3+53)
=−1(x+5)(x2−5x+25)