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Question

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


  1. 0

  2. -2

  3. 4

  4. -4


Solution

The correct option is C

4


 For, x24x+k=0, value of discriminant D = (4)24k=164k

 The roots of quadratic equation are co-incident only when D =0.

  16 - 4k = 0

  k = 4

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