Check whether the following are quadratic equation

Posted on 2014-06-25 11:38:00 in Math by

Check whether the following are quadratic equations:

1. 
   X(x + 1) + 8 = (x + 2) (x + 3)


2. 
   (x + 6) = 0


3. 
   X + 1/x = 1,x ? 0


4. 
   4x² + 6x + 1 = x² +2x +3


5. 
   X² + 1/x² = 2, ? 0

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