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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 β†’ a = 2
    - b + 6 = 0 β†’ b = -6
    - c - 1 = 0 β†’ c = 1

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

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