6th Class Mathematics Algebra Question Bank Algebra

  • question_answer
    If \[x+\frac{1}{x}=5\] (where\[x\ne 0\]) then find \[\frac{2x}{3{{x}^{2}}-5x+3}=?\]

    A) \[\frac{1}{2}\]                        

    B)  \[\frac{1}{3}\]

    C) \[\frac{1}{4}\]                        

    D) \[\frac{1}{5}\]

    Correct Answer: D

    Solution :

    \[x+\frac{1}{x}=5\] Then \[\frac{2x}{3{{x}^{2}}-5x+3}=\frac{\frac{2x}{3}}{\frac{3{{x}^{2}}}{x}-\frac{5x}{x}+\frac{3}{x}}\] \[=\frac{2}{3x+\frac{3}{x}-5}\] \[=\frac{2}{3\left( x+\frac{1}{x} \right)-5}=\frac{2}{3\times 5-5}=\frac{2}{10}=\frac{1}{5}\]


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