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    Question

    If x + y + z = 10 and x² + y² + z² = 80 then what is

    the value of 4xy + 4yz +4zx?
    A 40 Correct Answer Incorrect Answer
    B 20 Correct Answer Incorrect Answer
    C 10 Correct Answer Incorrect Answer
    D 30 Correct Answer Incorrect Answer

    Solution

    The correct answer is A

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