Question

( x+ y+z) (x+y -z) -x2y - y2z- 4xy evaluaion the following at x=-1,x=-2,z=0​

Answer 1

(x+y+z) (x+y-z)- x2y-y2z-4xy
(-1+ (-2)+0) (-1+(-2)-0)-(-1)2*(-2)-(-2)2*0-4*-1*-2
-1-2+0-1-2-0+1*2*-2+2*2*0-4*-1*-2
-1-2+0-1-2-0-4+4-8
6-8
-2
I hope this is right answer...