\lim_{x \to \infty} \frac{ x^{3}+ x^{2} }{3- x^{2} } 

[tex]lim_{x->\infty} \frac{x^3+x^2}{3-x^2}=\\\\lim_{x->\infty} \frac{1+\frac{1}{x}}{\frac{3}{x^3}-\frac{1}{x}}=|\frac{1}{0}|=\infty[/tex]