Question

Simplify : (x +y -z)(x +y +z). Please answer correctly

Answer 1

Step-by-step explanation:

(x + y - z)(x + y + z)

now, first we multiply …

x² + xy + xz + xy + y² + yz - xz - yz + (-z²)

{xy-xy and yz-yz =0.Also, xy+xy=2xy}

=> x² + y² + z² + 2xy

Answer 2

please see the attachment