SSC Quantitative Aptitude Algebra Question Bank Elementary Algebra (II)

  • question_answer
    If \[x+\frac{1}{x}=5,\]then the value of \[\frac{2x}{3{{x}^{2}}-5x+3}\]is

    A) \[2\]

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

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

    D) \[\frac{3}{5}\]

    Correct Answer: C

    Solution :

    [c] Given, \[x+\frac{1}{x}=5\] Now,     \[\frac{2x}{3{{x}^{2}}-5x+3}\] On dividing numerator and denominator by x \[\frac{2x}{3{{x}^{2}}-5x+3}=\frac{\frac{2x}{x}}{\frac{3{{x}^{2}}}{x}-\frac{5x}{x}+\frac{3}{x}}\] \[=\frac{2}{3x-5+\frac{3}{x}}=\frac{2}{3\left( x+\frac{1}{x} \right)-5}\] \[=\frac{2}{3(5)-5}=\frac{2}{15-5}=\frac{2}{10}=\frac{1}{5}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner