Question

b) 2x (z-x-y) and 2 y(z-y - x) ​

Answer 1

2x(z−x−y)=2xz−2x

2

−2xy

2y(z−y−x)=2yz−2y

2

−2xy

So, 2x(z−x−y)+2y(z−y−z)=2xz−2x

2

−4xy+2yz−2y

2