A cura di: Administrator

Limite in forma indeterminata $infty-infty$

$lim_{x rightarrow +infty} sqrt{x^2-3x+1}-sqrt{x^2+x-2} =$$= lim_{x rightarrow +infty} frac{x^2-3x+1-x^2-x+2}{sqrt{x^2-3x+1}+sqrt{x^2+x-2}} =$$lim_{x rightarrow +infty} frac{-4x+3}{xcdotBig(sqrt{1-frac{3}{x}+frac{1}{x^2}}+sqrt{1+frac{1}{x}-frac{2}{x^2}}Big)} =$$=lim_{x rightarrow +infty} frac{-4+frac{3}{x}}{sqrt{1-frac{3}{x}+frac{1}{x^2}}+sqrt{1+frac{1}{x}-frac{2}{x^2}}} = -2$