Question

simplify - (x+y) (x-y-xy) + (x-y) (-x+y+xy)

please answer this question i request you please​

Answer 1

$\sf{\left(x+y\right)\left(x-y-xy\right)+\left(x-y\right)\left(-x+y+xy\right)}$

$\sf{=-x^2y-xy^2+x^2-y^2+\left(x-y\right)\left(-x+y+xy\right)}$

$\sf{=-x^2y-xy^2+x^2-y^2+2xy+x^2y-xy^2-x^2-y^2}$

$\sf{=-x^2y+x^2y+x^2-x^2-xy^2-xy^2+2xy-y^2-y^2}$

$\sf{=-x^2y+x^2y-xy^2-xy^2+2xy-y^2-y^2}y^2}$

$\sf{=-xy^2-xy^2+2xy-y^2-y^2}$

$\sf{=-2xy^2+2xy-y^2-y^2}$

$\bf{=-2xy^2+2xy-2y^2}$