Chapter 12, Problem 40RE

(a)

To determine

To approximate: the limit by using a graphing utility to graph the function..

Explanation of Solution

Given information:

Given following limit

  $\underset{x\to 0}{\lim }{e}^{\frac{-4}{x^2}}$

Calculation:

Let $f\left(x\right)=e^{\frac{-4}{x^2}}$ and plot the function $f\left(x\right)$ .

To calculate the model using the T1-83 graphing calculator follows the steps:

Press $Y=$ and enter the equation

  

Press ZOOM and choose the appropriate zoom function, then plot window is like this

  

From the graph we can see that the function converges to a single bounded values as it approaches 0 both from left and right side.

(b)

To determine

To approximate: the limit by using the table feature of the graphing utility to create a table.

Answer to Problem 40RE

Limit converages to a value of 0.

Explanation of Solution

Calculation:

Numerically approximate the limit using $f\left(x\right)=e^{\frac{-4}{x^2}}$ and tabulate it using the T1-83 graphing calculator, with following steps:

Press Y= and enter the equation

  

Press $2^{nd}$ key and window to set table

  

Press $2^{nd}$ key and graph button and enter the values of $x$ :

  

Limit converages to a value of 0