Question

x – y)(x + y) + (y – z)(y + z) + (z – x) (z + x) is equal to *

2 points

(a) 0

(b) x² + y² + z²

(c) xy + yz + zx

(d) x + y + z.

​

Answer 1

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

(x² - y²) + (y² - z²) + (z² - x²)

0 (zero)

options (a) 0 is the correct one.

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Answer 2

Answer:

(a) zero 0

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