Manipal Engineering Manipal Engineering Solved Paper-2012

  • question_answer
    The value of\[\int_{2}^{3}{\frac{\sqrt{x}}{\sqrt{5-x}+\sqrt{x}}}dx\]is

    A)  1                                            

    B)  1/2

    C)  2                            

    D)         None of these

    Correct Answer: B

    Solution :

    Let          \[I=\int_{2}^{3}{\frac{\sqrt{x}}{\sqrt{5-x}+\sqrt{x}}dx}\]                              ... (i) \[\therefore \]  \[I=\int_{2}^{3}{\frac{\sqrt{5-x}}{\sqrt{x}+\sqrt{5-x}}dx}\]                          ... (ii) On adding Eqs. (i) and (ii), we get             \[2I=\frac{3\sqrt{x}+\sqrt{5-x}}{\sqrt{x}+\sqrt{5-x}}dx\]                   \[=\int_{2}^{3}{1\,\,dx}=3-2=1\] \[\Rightarrow \]       \[I=\frac{1}{2}\]


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