The right choice is: A <em>whole</em> number constant could have been <em>subtracted</em> from the <em>exponential</em> expression.
Let be an <em>exponential</em> function of the form , where and are <em>real</em> numbers. A <em>horizontal</em> asymptote exists when , which occurs for .
For this function, the <em>horizontal</em> asymptote is represented by and to change the value of the asymptote we must add the <em>parent</em> function by another <em>real</em> number (), that is to say:
(1)
In this case, we must use to obtain an horizontal asymptote of -3. Thus, the right choice is: A <em>whole</em> number constant could have been <em>subtracted</em> from the <em>exponential</em> expression.
To learn more on asymptotes, we kindly invite to check this verified question: brainly.com/question/8493280