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    Question

    What should be the value of t in the equation x² + tx + 64

    = 0 so that it has two equal real roots?
    A 11 Correct Answer Incorrect Answer
    B Both 16 and -16 Correct Answer Incorrect Answer
    C 19 Correct Answer Incorrect Answer
    D 27 Correct Answer Incorrect Answer

    Solution

    ATQ,
    Equal roots condition: Discriminant = 0

    t² - 4×1×64 = 0

    ⇒ t² = 256

    ⇒ t = ±16

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