Question
Tue April 14, 2015 By: Sriradha Gupta

Sir, could you please solve this one?
Sir, could you please solve this one, Question no 89591, Mathematics

Expert Reply
Prasenjit Paul
Wed April 15, 2015
2 x plus 1 equals 0 therefore x equals negative 1 half left parenthesis 2 x plus 1 right parenthesis space i s space a space f a c t o r space o f space x cubed left parenthesis 3 b plus 2 right parenthesis plus left parenthesis b minus 1 right parenthesis f left parenthesis x right parenthesis equals x cubed left parenthesis 3 b plus 2 right parenthesis plus left parenthesis b minus 1 right parenthesis rightwards double arrow f open parentheses negative 1 half close parentheses equals open parentheses negative 1 half close parentheses cubed left parenthesis 3 b plus 2 right parenthesis plus left parenthesis b minus 1 right parenthesis rightwards double arrow 0 equals negative 1 over 8 left parenthesis 3 b plus 2 right parenthesis plus left parenthesis b minus 1 right parenthesis rightwards double arrow 0 equals negative fraction numerator 3 b plus 2 over denominator 8 end fraction plus fraction numerator 8 left parenthesis b minus 1 right parenthesis over denominator 8 end fraction rightwards double arrow 0 equals fraction numerator negative 3 b minus 2 plus 8 b minus 8 over denominator 8 end fraction rightwards double arrow 0 equals 5 b minus 10 rightwards double arrow 5 b equals 10 therefore b equals 2
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