Question

92
5. Prove that (x - y) (x + y) + (y – z) (y + z) + (z - x) (2 + x) = 0.​

Answer 1

Answer:

$(a - b)(a + b) = a {}^{2} - b {}^{2}$

x^2 - y^2 + y^2 - z^2 + z^2 - x^2 = 0

Answer 2

Answer:

Step-by-step explanation:

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

X^2-y^2+y^2-z^2+z^2-x^2

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