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      Question

      (x + 4) 2 + (y – 1) 2 + (z +

      2) 2 = 0, then find the value of 2x - 3y + z.
      A -13 Correct Answer Incorrect Answer
      B 13 Correct Answer Incorrect Answer
      C -12 Correct Answer Incorrect Answer
      D 12 Correct Answer Incorrect Answer

      Solution

      If (x + 4) 2 + (y – 1) 2 + (z + 2) 2 = 0, then (x = - 4), (y = 1), and (z = - 2).

      So,
      - x + 4 = 0 → x = -4
      - y - 1 = 0 → y = 1
      - z + 2 = 0 → z = -2

      Therefore, required value:
      2(-4) - 3(1) + (-2) = -8 - 3 - 2 = -13

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