Chapter 2.2, Problem 25E

Evaluating limits graphically Sketch a graph of f and use it to make a conjecture about the values of $f\left(a\right),\underset{x\to a^{-}}{\lim }f\left(x\right),\underset{x\to a^{+}}{\lim }f\left(x\right)$ and $\underset{x\to a}{\lim }f\left(x\right)$ or state that they do not exist.

  25.     $f\left(x\right)=\frac{x^2+x-2}{x-1};a=1$