Chapter 7.5, Problem 1GP

To determine

To graph the function $y=7^x$ , find its domain, range and equation of the asymptote.

Explanation of Solution

Given:

Function: $y=7^x$

Calculation for graph:

Consider $y=7^x$

Values of x	Values of y
0	1
1	7
2	49
3	343
-1	0.14

By taking different values of x , the graph can be plotted.

Graph:

  

Interpretation:

Domain:

The domain of the expression $y=7^x$ is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.

Hence,

Domain: $(-\infty ,\infty )$

Range is the set of all y -values that the function passes through.

Hence,

Range: $(0,\infty )$ for all y, $y>0$

Asymptotes:

Exponential functions have only horizontal asymptotes.

So, there will be no vertical asymptotes, since the function do not have a denominator.

Therefore, the equation of horizontal asymptote is $y=0.$