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Question

The range of alpha for which the points left parenthesis alpha comma 2 plus alpha right parenthesis and left parenthesis fraction numerator 3 alpha over denominator 2 end fraction comma alpha to the power of 2 end exponent right parenthesis lie on opposite side of the line 2x+3y=6 is

  1. left parenthesis negative infinity comma negative 2 right parenthesis union left parenthesis 01 right parenthesis    
  2. (0,4)    
  3. left parenthesis fraction numerator 1 over denominator 2 end fraction comma 1 right parenthesis    
  4. none of these    

The correct answer is: left parenthesis negative infinity comma negative 2 right parenthesis union left parenthesis 01 right parenthesis


    f left parenthesis alpha comma 2 plus alpha right parenthesis equals 5 alpha
    f left parenthesis fraction numerator 3 alpha over denominator 2 end fraction comma alpha to the power of 2 end exponent right parenthesis equals 3 alpha plus 3 alpha to the power of 2 end exponent minus 6
    5 alpha left parenthesis 3 alpha plus 3 alpha to the power of 2 end exponent minus 6 right parenthesis less than 0 equals alpha left parenthesis alpha plus 2 right parenthesis left parenthesis alpha minus 1 right parenthesis less than 0

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