Question

evalute the following: 1) xsquare +ysquare - z square -3xyz, if x=1,y -1, z=3​

Answer 1

Answer-

x2+y2-z2-3xyz x=1,y= -1,z=3

(1)2+( -1)2 -(3)2 -(3×1×( -1)×3)

1+1 -9+9

2