Question

    If both the roots of x 2  + kx + 49 = 0 are

    real and equal, then find the value of 'k'.
    A -7 Correct Answer Incorrect Answer
    B -14 Correct Answer Incorrect Answer
    C 14 Correct Answer Incorrect Answer
    D Both 14 and - 14 Correct Answer Incorrect Answer

    Solution

    If both the roots of equation ax 2  + bx + c = 0 are real and equal, then b 2  - 4ac = 0.

    So, k 2  - 4 X 49 = 0

    Or, k 2  = 196

    Or, 'k' = +14, - 14

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