Find asymptotes

asymptotes\:y=\frac{x^2+x+1}{x} asymptotes\:f(x)=x^3; asymptotes\:f(x)=\ln (x-5) asymptotes\:f(x)=\frac{1}{x^2} asymptotes\:y=\frac{x}{x^2-6x+8} asymptotes\:f(x)=\sqrt{x+3}