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    Question

    For a =-4 and b = 5, value of a² – b²

    is:
    A -1 Correct Answer Incorrect Answer
    C -9 Correct Answer Incorrect Answer
    D 7 Correct Answer Incorrect Answer

    Solution

    a = -4, b = 5 a² – b² =(a+b) (a-b) = (-4+5) (-4-5) =-9.

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