text: Q. 93.7( 6 Votes )
  
  If the equation (
  
  If the roots are equal then d = b2 – 4ac = 0
  
  Here a = (a2 + b2), b = 2 (ac + bd), c = (c2 + d2)
  
  D = b2 – 4ac = 0
  
  b2 = 4ac
  
  {– 2(ac + bd)}2 = 4{(a2 + b2) (c2 + d2)}
  
  4(a2c2 + b2d2 + 2acbd) = 4(a2c2 + a2d2 + b2c2 + b2d2)
  
  2acbd = a2d2 + b2c2
  
  a2d2 + b2c2 – 2abcd = 0
  
  (ad – bc)2 = 0
  
  ad – bc = 0
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