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If x2 + y2 + z2 + 2 = 2(y – x), then value of x3 + y3 + z3 is equal to

a

0

b

3

c

1

d

2

Answer : Option A
Explanation :

x2 + y2 + z2 + 2 = 2(y – x)

⇒ x2 + 2x + y2 – 2y + z2 + 2 = 0

⇒ (x2 + 2x +1) + (y2 – 2y +1) + z2 = 0

⇒ (x + 1)2 + (y – 1)2 + z2 = 0

⇒ x + 1 = 0 ⇒ x = –1

y – 1 = 0 ⇒ y = 1

z = 0

∴ x3 + y3 + z3 = –1 + 1 + 0 = 0

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