Q. 53 - Precalculus Enhanced with Graphing Utilities

Question

Begin with the graph of $y=e^x$ and use transformation to graph the function. Determine the domain, range and horizontal asymptote of the function.

$f\left(x\right)=e^{-x}$

Step-by-Step Solution

Answer

The graph of the function is given below,

Domain: All real numbers.

Range: $\left(0,\infty \right) or \left\{y|y>0\right\}$

Horizontal asymptote: $y=0$

Step 1. Given information.

Consider the given function,

$f\left(x\right)=e^{-x}$

First, plot the graph of $y=e^x$. Replace x with $-x$ and reflect about y-axis,

Step 2. Determine the characteristics of the function.

Consider the given function,

$f\left(x\right)=e^{-x}$

From the graph, the domain of the function is the set of all real numbers.

The range is $\left\{y|y>0\right\}$ or the interval $\left(0,\infty \right)$.

Horizontal asymptote is $y=0$