JCECE Engineering JCECE Engineering Solved Paper-2015

  • question_answer
    The solution set of the in equation\[\frac{|x+3|+x}{x+2}>1\], is

    A) \[(-5,\,\,-2)\cup (-1,\,\,\infty )\]              

    B) \[(-5,\,\,-2)\]

    C) \[(-1,\,\,\infty )\]                            

    D)  None of these

    Correct Answer: A

    Solution :

    We have,                 \[\frac{|x+3|+x}{x+2}>1\] Now, two cases arise: Case I When\[x+3\ge 0,\,\,i.e.\,\,x\ge -3\] In this case, we have                 \[|x+3|\,\,=x+3\] Now,     \[\frac{|x+3|-2}{x+2}>0\] \[\Rightarrow \]               \[\frac{x+3-2}{x+2}>0\] \[\Rightarrow \]               \[\frac{x+1}{x+2}>0\] \[\Rightarrow \]               \[x\in (-\infty ,\,\,-2)\cup (-1,\,\,\infty )\] But,        \[x\ge -3\] \[\therefore \]  \[x\in [-3,\,\,-2)\cup (-1,\,\,\infty )\] Case II When\[x+3<0,\,\,i.e.,\,\,x<-3\] In this case, we have                 \[|x+3|\,\,=-(x+3)\] Now,     \[\frac{|x+3|-2}{x+2}>0\] \[\Rightarrow \]               \[\frac{-(x+3)-2}{x+2}>0\] \[\Rightarrow \]               \[\frac{-x-5}{x+2}>0\] \[\Rightarrow \]               \[\frac{x+5}{x+2}<0\] \[\Rightarrow \]               \[-5<x<-2\] But\[x<-3\]. \[\therefore \]  \[x\in (-5,\,\,-3)\] Hence, the solution set of the given inequation is                 \[(-5,\,\,-2)\cup (-1,\,\,\infty )\]


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