If a² + b² = 0 ⇒ a = 0 and b = 0 ∴ (2x – y)² + (3y – 2z)² = 0 ∴ 2x – y = 0 ⇒ 2x = y ⇒ x : y = 1 : 2 and, 3y – 2z = 0 ⇒ 3y = 2z ⇒ y : z = 2 : 3 ∴ x : y : z = 1 : 2 : 3
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