Limits involving absolute values often involve breaking things into cases.
Remember that
|f(x)|={f(x), if f(x)≥0;−f(x), if f(x)≤0.
By studying these cases separately,
we can often get a good picture of what a function is doing just to the left
of x=a, and just to the right of x=a. By combining these, we can understand
the limit as x→a.