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    3. Quantitative Aptitude
    4. Quadratic equation
    5. Determine the value of m so that the equation x² + mx + 25 = 0 has equal and real roots.

    Question

    Determine the value of m so that the equation x² + mx + 25

    = 0 has equal and real roots.
    A 18 Correct Answer Incorrect Answer
    B 24 Correct Answer Incorrect Answer
    C 14 Correct Answer Incorrect Answer
    D Both 10 and -10 Correct Answer Incorrect Answer

    Solution

    ATQ,
    Condition for equal roots: Discriminant = 0

    m² - 4×1×25 = 0

    ⇒ m² = 100

    ⇒ m = ±10

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