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    Question

    Find the value x2 + y2, if xy = 13

    and x + y = 7.
    A 20 Correct Answer Incorrect Answer
    B 26 Correct Answer Incorrect Answer
    C 23 Correct Answer Incorrect Answer
    D 30 Correct Answer Incorrect Answer

    Solution

    We know that (x + y)2 = x2 + 2xy + y2 = x2 + y2 = (x + y)2 – 2xy = 72 – 2(13) = 49 – 26 = 23

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