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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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