Calculus
limx→∞f(x)\lim_{x\rightarrow\infty}f\left(x\right)limx→∞f(x)=15=\frac15=51
limx→−∞f(x)\lim_{x\rightarrow-\infty}f\left(x\right)limx→−∞f(x)=15=\frac15=51
Horizontal asymptote: y=15y=\frac15y=51
limx→−∞f(x)\lim_{x\rightarrow-\infty}f\left(x\right)limx→−∞f(x)=−15=-\frac15=−51
Horizontal asymptotes: y=5y=5y=5 and y=−5y=-5y=−5
limx→∞f(x)\lim_{x\rightarrow\infty}f\left(x\right)limx→∞f(x)=13=\frac13=31
limx→−∞f(x)\lim_{x\rightarrow-\infty}f\left(x\right)limx→−∞f(x)=−13=-\frac13=−31
Horizontal asymptotes: y=3y=3y=3 and y=−3y=-3y=−3
limx→−∞f(x)\lim_{x\rightarrow-\infty}f\left(x\right)limx→−∞f(x)=13=\frac13=31
No horizontal asymptote