Question

If xyz are in an aptje find the value of (x+y-z)(y+z-x)

Answer 1

x(y+z-x)+y(y+z-x)-z(y+z-x)
xy+xz-x2+y2+yz-yx-zy-z2+zx
-x2+y2-z2+2xz
hope this wll help u