Question 1096476
{{{x^4y^2-x^3y^3+x^2y^4-xy^5}}}
= {{{xy^2(x^3-x^2y+xy^2-y^3)}}}
= {{{xy^2((x^2(x-y) + y^2(x-y)))}}}
= {{{xy^2(x^2+y^2)(x-y)}}}