Solving gives us which serve as the x-axis intercepts for the inverted parabola. Graph the parabola and you have two reigions on your plane, we now have to decide which region is required.

So choose a point anywhere i.e. and substitute into the equation.

If this statement is correct then this point falls in the required region, otherwise if false, reject this region and choose the other.

which is false so reject this region.