Please show me how to factor X^3 + 125
in your repertoire of factoring techniques and formulas, you should have:
x^3 + y^3 = (x+y)(x^2 - xy + y^2)
and
x^3 - y^3 = (x-y)(x^2 + xy + y^2)
so ....
x^3 + 125
= x^3 + (5)^3
= (x+5)(.....)
let me know what you get