Science:Math Exam Resources/Courses/MATH100/December 2016/Question 09 (a) (iii)/Hint 1

Recall the definition of the horizontal asymptote:

The line $y=b$ is the horizontal asymptote of the function $y=f(x)$ if ${\underset {x\to \infty }{\lim }}f(x)=b$ or ${\underset {x\to -\infty }{\lim }}f(x)=b$ .