Quadratic Inequalities HelpWatch
E.g. , so mult both side by -1 and we should have .
If you want to multiply through by then you need to consider two cases; one where it is positive, and one where it is negative.
The usual approach, however, is to multiply through by instead [or generally, by the square of whatever the denominator is]. This is because is always positive, so you know that the inequality sign will not reverse.
Anyway, to help you with your question, you should notice (before doing anything) that the denominator on the LHS factorises nicely. We have;
So, in order to clear the denominators, and preserve the inequality, you should multiply both sides through by to obtain
From there on in it should be straighforward to solve if you decide to move the RHS to LHS and fully factorise.