I suggest you to separate the 2 cases and
In the first case you get
Find the solutions and take the ones that are
Do the same for the second case and finally join the 2 sets of solutions
you need c-ordination here,
you have made errors with polarity above.
If x is positive, this is
this is negative if one factor is positive and the other negative.
If -3<x<4 the left factor is negative and the right one positive.
But remember, x must be positive here.
If x>4, they are both positive.
If x<-3 they are both negative.
If x is negative, this is
This can be evaluated in the same way as above.