J & K CET Engineering J and K - CET Engineering Solved Paper-2006

  • question_answer
    \[\int_{-2}^{2}{(x-|x|)}\,\,dx\] is equal to

    A)  \[0\]               

    B)  \[2\]

    C)  \[4\]               

    D)  \[-4\]

    Correct Answer: D

    Solution :

    We know that, \[|x|=\left\{ \begin{matrix}    -x, & if & x<0  \\    x, & if & x\ge 0  \\ \end{matrix} \right.\] \[\therefore \] \[\int_{-2}^{2}{(x-|x|)\,\,dx}\] \[=\int_{-2}^{0}{\{x-(x)\}dx+\int_{0}^{2}{(x-x)dx}}\] \[=\int_{-2}^{0}{2x\,\,dx+0}\] \[=2\left[ \frac{{{x}^{2}}}{2} \right]_{-2}^{0}\] \[=2\left[ 0-\frac{{{(-2)}^{2}}}{2} \right]=-4\]


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