Question

Simplify: (x + y)(x - y) + (y + z)(y - z) + (z + x)(z - x)​

Answer 1

Answer:

The value is 0

Step-by-step explanation:

(x + y)(x - y) + (y + z)(y - z) + (z + x)(z - x)​

use identity: (a + b)(a - b) = a² - b²

x² - y² + y² - z² + z² - x²

= 0