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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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