Answers

2016-07-25T02:06:42+08:00
       x² + 2x - 15  >   0
first step, just solve it like a quadratic equation
   thus    ( x+5)(x-3) = 0
                x   =   -5   or   3
     this is a   u  shape graph that opens at the top
      and intersect the x   axis at   x  =   -5   &  x  =  3
       since the expression is greater than  0
          then   x  <  -5  or   x  > 3
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