Question

add 2x(z-x-y)and 2y(z-y-x)

Answer 1

2x(z-x-y)and 2y(z-y-x)
=2xz-2x(squqre)-2xy+2yz-2y(square)-2xy
=2xz-2x(squqre)-2xy-2xy+2yz-2y(square)
=2xz-2x(square)-4xy+2yz-2y(square)

Answer 2

2x(z-x-y) + 2y(z-y-x)

=2xz - 2xsq + 2xy + 2yz - 2ysq - 2xy

= 2xz - 2xsq + 2yz - 2xy..

Where is sq it means square I write the short form ...