Question

Prove that (x - y) (x + y) + (y - 3) (y + 2) + (2 - x) (3 + x) = 0.​

Answer 1

Answer:

Let both x and y be 0

Step-by-step explanation:

Simple

Answer 2

Answer:

x^2+2y^2+11

Step-by-step explanation:

(x-y)(x+y)+(y-3)(y+2)+(2-x)(3+x) = 0

= x-y*x+y+y-3*y+3+2-x*3+x

= x^2+2y^2+11