Chapter 4 - Exponential Functions - 4.3 Graphs of Exponential Functions - Exercises and Problems for Section 4.3 - Exercises and Problems - Page 162: 32

See graph below.

As $y=ab^x\rightarrow 0$ when $x\rightarrow -\infty$ and $y\rightarrow -\infty$ when $x\rightarrow \infty$ when $b>1$ and $a<0$, let's consider a function in the form $$y=ab^x,a<0,b>1.$$ A plot of such a function is shown below.