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    Question

    If a + (1/a) = 2, then find the value of (a5

    + a3 + 6)/(7a тАУ 5).┬а
    A 5 Correct Answer Incorrect Answer
    B 4 Correct Answer Incorrect Answer
    C 2 Correct Answer Incorrect Answer
    D 6 Correct Answer Incorrect Answer

    Solution

    Given, a + (1/a) = 2 Or, a2 + 1 = 2a Or, a2 тАУ 2a + 1 = 0 Or, a2 тАУ a тАУ a + 1 = 0 Or, a(a тАУ 1) тАУ 1(a тАУ 1) = 0 Or, (a тАУ 1)(a тАУ 1) = 0 Or, a = 1 So, (a5 + a3 + 6)/(7a тАУ 5) = (1 + 1 + 6)/(7 тАУ 5) = 8/2 = 4

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