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    Question

    If ab = -15 and (a2 + b2) = 34,

    then find the value of (a – b).
    A 12 Correct Answer Incorrect Answer
    B 8 Correct Answer Incorrect Answer
    C 2 Correct Answer Incorrect Answer
    D 4 Correct Answer Incorrect Answer

    Solution

    We know that, (a – b)2 = a2 + b2 – 2ab ATQ; (a – b)2 = 34 – 2 × (-15) (a – b)2 = 64 (a – b) = ±8

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