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    Question

    If x + 1/x = 4, then x3 + 1/x3

    is:
    A 78 Correct Answer Incorrect Answer
    B 42 Correct Answer Incorrect Answer
    C 52 Correct Answer Incorrect Answer
    D 32 Correct Answer Incorrect Answer

    Solution

    ATQ, Using identity: x3 + 1/x3 = (x + 1/x)3 - 3(x + 1/x) = 43 - 3 x 4 = 64 - 12 = 52

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