Question

X(X-Y)+Y(X-Y)

Answer 1

\(x\left(x-y\right)+y\left(x-y\right)=\left(x+y\right)\left(x-y\right)\)

Answer 2

\(x\left(x-y\right)+y\left(x-y\right)=\left(x+y\right)\left(x-y\right)\)

Answer 3

\(x\left(x-y\right)+y\left(x-y\right)=x^2-xy+xy-y^2=x^2-y^2=\left(x-y\right)\left(x+y\right)\)