Q. What is the number of quadratic equation which are unchanged by squaring their roots?
  1. 2
  2. 4
  3. 6
  4. None of these
Q. ​If equations a a x 2 + 2 c x + b   =   0   a n d   a x 2 + 2 b x + c   =   0   ( b c ) and have a common root, then a+4b+4c  is equal to
  1. 0
  2. 1
  3. -1
  4. -2

  • -1
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