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    Question

    (a + 7)2 + (b тАУ 2) 2 + (c +

    3) 2 = 0, then find the value of 3a - 2b + c.
    A -28 Correct Answer Incorrect Answer
    B 28 Correct Answer Incorrect Answer
    C 18 Correct Answer Incorrect Answer
    D -18 Correct Answer Incorrect Answer

    Solution

    If (a + 7)2 + (b тАУ 2) 2 + (c + 3) 2 = 0, then (a = -7), (b = 2), and (c = -3).

    So,
    - a + 7 = 0 тЖТ a = -7
    - b - 2 = 0 тЖТ b = 2
    - c + 3 = 0 тЖТ c = -3

    Therefore, required value:
    3(-7) - 2(2) + (-3) = -21 - 4 - 3 = -28

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