Question

Evaluate each of the following expressions for x = -2, y = -1, z = 3:
x2 + y2 + z2 – xy – yz – zx
​

Answer 1

Step-by-step explanation:

x*2+y*2+z*2+x*y-y*z-z*x

(-2*2)+(-1*2)+(3*2)-(-2*-1)-(-1*3)-(3*-2)

(-4)+(-3)+6-2-(-3)-(-6)

-1-11

-12