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    Question

    What are the values of k, if the roots of the equation

    x┬▓ + 2(k - 4)x + 2k = 0 are equal?
    A 3, 2 Correct Answer Incorrect Answer
    B 5, 2 Correct Answer Incorrect Answer
    C 6, 3 Correct Answer Incorrect Answer
    D 8, 2 Correct Answer Incorrect Answer

    Solution

    Given, the roots of the equation x┬▓ + 2(k - 4)x + 2k = 0 are equal. When roots are equal then b┬▓ = 4ac тЗТ [2(k - 4)]┬▓ = 4 * 1 * 2k тЗТ 4(k - 4)┬▓ = 8k тЗТ k┬▓ - 8k + 16 = 2k тЗТ k┬▓ - 10k + 16 = 0 тЗТ (k - 2) (k - 8) = 0 тЗТ k = 2, 8

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