Question

x² + y² - z² - 3xyz if x=1, y= -1,z=2​

Answer 1

Step-by-step explanation:

x²+y²-z²-3xyz x=1,y=-1,z=2

(1)²+(-1)²-(2)²-3(1)(-1)(2)

1+1-4+6

2-4+6

2+2

4