Il denominatore è maggiore di zero perchè -2 meno lo si deve pensare, ad esempio, come -2,1 e quindi elevato al quadrato è maggiore di 4 e quindi la differenza è maggiore di zero. E’ giusto?
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![\[\lim_{x \to -2^-} \frac {x+3}{x^2-4}=+ \infty\]](http://www.matebook.it/wp-content/ql-cache/quicklatex.com-58f8cd25368d0a7d8c885f601535dd74_l3.png "Rendered by QuickLaTeX.com")
il limite tenderà ad infinito. La positività è data dal fatto che:
Il denominatore è maggiore di zero perchè -2 meno lo si deve pensare, ad esempio, come -2,1 e quindi elevato al quadrato è maggiore di 4 e quindi la differenza è maggiore di zero. E’ giusto?
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