Chapter 2.2, Problem 28E

  Estimating limits graphically and numerically Use a graph of f to estimate $\underset{x\to a}{\lim }f\left(x\right)$ or to show that the limit does not exist. Evaluate f(x) near $x=a$ to support your conjecture.

  28.     $f\left(x\right)=\frac{e^{2x}-2x-1}{x^2};a=0$