Limits can be written to describe the behavior of a function as the value of 'x' approaches a value from a positive or negative direction. We can also solve for a limit as the function approaches from each direction. When evaluating a limit from the left, we are approaching the limit from the left with increasing values of 'x'. This is written as:
$\underset{x\to {c}^{-}}{lim}\mathrm{f\left(x\right)}$
In this example, we evaluate
$\underset{x\to {2}^{-}}{lim}\frac{x+4}{x-2}$
One-sided infinite limits from negative direction