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    Question

    Suppose both the roots of q² + kq + 49 = 0 are real and

    equal, then determine the value of 'k'.
    A -12 Correct Answer Incorrect Answer
    B Both +14 and -14 Correct Answer Incorrect Answer
    C +18 Correct Answer Incorrect Answer
    D +14 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Suppose both the roots of equation ax² + bx + c = 0 are real and equal, then b²- 4ac = 0.

    So, k²- 4 × 49 = 0

    Or, k² = 196

    Or, 'k' = ±14

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