Question

2. If x = 3, y = 1 and 2 = -4, find the value of each of the following expressions.
(1) x2 + y2 +22 + 2xy + 2yz +2 zx​

Answer 1

Answer:

x²+y²+z²+2xy+2yz+2zx

Put x=3, y=1, z=-4 in above equation

(3)²+(1)²+(-4)²+2(3)(1)+2(1)(-4)+2(-4)(3)

9+1+16+6-8-24

32-32

0, is the answer