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Question

Find the value of k for which x24x+k=0 has equal roots.


  1. 0

  2. -2

  3. 4

  4. -4


Solution

The correct option is C

4


For x24x+k=0, a = 1, b = -4, c = k

D=b24ac

D=424k=164k

 The roots of quadratic equation are equal only when D=0

 164k=0

 k=4

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