SOLUTION: For the function ​g(x)=x+8/x+2, solve the following inequality. ​g(x)>0

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Question 1168423: For the function ​g(x)=x+8/x+2, solve the following inequality.
​g(x)>0

Answer by ikleyn(53765)   (Show Source): You can put this solution on YOUR website!
.

In order for  g(x)  be positive,  both the numerator and denominator should be EITHER both positive, OR both negative.


So, we consider two cases.


Case (a).  x+8 > 0  AND  x+2 > 0.

     The solution set to these two inequalities is  {x > - 8}  AND  {x > - 2}.

     The last two inequalities are EQUIVALENT to  one single inequality  x > -2.



Case (b).  x+8 < 0  AND  x+2 < 0.

     The solution set to these two inequalities is  {x < - 8}  AND  {x < - 2}.

     The last two inequalities are EQUIVALENT to  one single inequality  x < -8.



Thus the final solution to your problem is this:


    {x < -8}  or  {x > -2},


Or in the interval form


    (-oo,-8) U {-2,oo)    (union of two sets).

Solved.



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