8th Class Mathematics Algebraic Expressions Question Bank Algebra

  • question_answer
    Find the roots of \[\left( x+3\sqrt{3} \right)\left( \sqrt{3}x+2 \right)\]

    A)  \[10t+u+1\]              

    B)  \[100t+10u+1\]

    C)  \[t+u+1\]                  

    D) None of these

    Correct Answer: C

    Solution :

    Given \[3x-2=\frac{8}{x}\] Multiplying by x on both sides, we get             \[\frac{1}{x}-\frac{3}{4}+\frac{1}{2+x}=0\]             \[\Rightarrow \]\[3{{x}^{2}}-2x-8=0\]             \[\Rightarrow \] \[3{{x}^{2}}-6x+4x-8=0\]             \[\Rightarrow \] \[(-8,0)\] \[\Rightarrow \] \[(x-2)\,(3x+4)=0\]             \[\Rightarrow \]\[(x-2)=0\]or \[3x+4=0\] \[\Rightarrow \] \[x=2\] or \[\frac{1}{x}-\frac{3}{4}+\frac{1}{2+x}=0\] \[\left( -\frac{4}{3},2 \right)\] The roots are \[\frac{1}{x}+\frac{1}{2+x}=\frac{3}{4}\]


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