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    Question

    If the quadratic equation x² + 18x + n = 0 has real and

    equal roots, what is the value of n?
    A 81 Correct Answer Incorrect Answer
    B 64 Correct Answer Incorrect Answer
    C 41 Correct Answer Incorrect Answer
    D Both 56 and -56 Correct Answer Incorrect Answer

    Solution

    ATQ,
    Discriminant = 0 ⇒ 18² - 4×1×n = 0

    ⇒ 324 = 4n

    ⇒ n = 81

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