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    Question

    Suppose xy = -15 and (x² + y²) = 34, then determine

    the value of (x – y).
    A ±25 Correct Answer Incorrect Answer
    B ±8 Correct Answer Incorrect Answer
    C ±11 Correct Answer Incorrect Answer
    D ±19 Correct Answer Incorrect Answer

    Solution

    ATQ,

    We know that, (x – y) ² = x² + y² – 2xy

    ATQ;

    (x – y) ² = 34 – 2 × (-15)

    (x – y) ² = 64

    (x – y) = ±8

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