If a² + b² + c² = 0 ⇒ a = 0, b = 0, c = 0 ∴ (x – 5)² + (y – 2)² + (z – 9)² = 0 ∴ x – 5 = 0 ⇒ x = 5 y – 2 = 0 ⇒ y = 2 z – 9 = 0 ⇒ z = 9 ∴ x + y – z = 5 + 2 – 9 = –2
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