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Quadratic equation 2x²-kx+5=0 to have equal roots, what should the value of K
  1. ±2√(10)
  2. ±4 √(10)
  3. ±10
  4. ±20
Explanation

Using formula:


b^2-4ac=0

Here:


  • a = 2

  • c = 5

So:

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