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  1. If (x – 5)² + (y – 2)² + (z – 9)² = 0, then value of (x + y – z) is :
    1. 16
    2. – 1
    3. – 2
    4. 12
Correct Option: C

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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