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      Question

      (a – 2) 2 + (b + 6) 2 + (c –

      1) 2 = 0, then find the value of a + b – c.
      A -5 Correct Answer Incorrect Answer
      B 5 Correct Answer Incorrect Answer
      C 8 Correct Answer Incorrect Answer
      D -8 Correct Answer Incorrect Answer

      Solution

      If (a – 2) 2 + (b + 6) 2 + (c – 1) 2 = 0, then (a = 2), (b = -6), and (c = 1).

      So,
      - a - 2 = 0 → a = 2
      - b + 6 = 0 → b = -6
      - c - 1 = 0 → c = 1

      Therefore, required value:
      2 + (-6) - 1 = 2 - 6 - 1 = -5

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