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      Question

      (x + 1)2 + (y – 3) 2 + (z +

      5) 2 = 0, then find the value of 2x + 3y - z.
      A 12 Correct Answer Incorrect Answer
      B -12 Correct Answer Incorrect Answer
      C 4 Correct Answer Incorrect Answer
      D 6 Correct Answer Incorrect Answer

      Solution

      If (x + 1)2 + (y – 3) 2 + (z + 5) 2 = 0, then (x = -1), (y = 3), and (z = -5).

      So,
      - x + 1 = 0 → x = -1
      - y - 3 = 0 → y = 3
      - z + 5 = 0 → z = -5

      Therefore, required value:
      2(-1) + 3(3) - (-5) = -2 + 9 + 5 = 12

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