Multiple choice

Among the following not a quadratic equation is

  1. $x ( 2 x + 3 ) = x ^ { 2 } + 1$
  2. $( x - 2 ) ^ { 2 } + 1 = 2 x - 3$
  3. $x ^ { 2 } + 3 x + 1 = ( x - 2 ) ^ { 2 }$
  4. $( x + 1 ) ^ { 2 } = 2 ( x - 3 )$
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