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    Question

    If ab = -15 and (a 2  + b 2 ) = 34,

    then find the value of (a – b).
    A 8 Correct Answer Incorrect Answer
    B 2 Correct Answer Incorrect Answer
    C 6 Correct Answer Incorrect Answer
    D 10 Correct Answer Incorrect Answer

    Solution

    We know that, (a – b) 2  = a 2  + b 2  – 2abATQ;

    (a – b) 2  = 34 – 2 × (-15)

    (a – b) 2  = 64

    (a – b) = ±8

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