Question

Simplify : (x + y ) ( x – y + xy) + (x – y ) ( x + y – xy )

Answer 1

Step-by-step explanation:

• x^2-xy+x^2y+xy-y^2+x^2+xy-x^2y-xy-y^2-xy^2
• x^2-y^2+x^2-y^2
• 2x^2+2y^2
• 2(x^2+y^2)