DUŻO PUNKTÓW! PROSZĘ O POMOC ;) Obliczyć lim ;) DZIĘKUJĘ!

[latex]lim_{n ightarrow infty}sqrt{n^2+25}-n=lim_{n ightarrow infty}frac{n^2+25-n^2}{sqrt{n^2+25}+n}=lim_{n ightarrow infty}frac{25}{sqrt{n^2+25}+n}=0 \ \ \ lim_{n ightarrow infty}sqrt{4n^2+5n-7}-2n= lim_{n o infty} frac{4n^2+5n-7-4n^2}{ sqrt{4n^2+5n-7} +2n} = \ \ = lim_{n o infty} frac{5}{ sqrt{4+0}+2 }= frac{5}{4} \ \ \ lim_{n o infty} sqrt{n+100}- sqrt{2n}= lim_{n o infty} frac{n+100-2n}{ sqrt{n+100} + sqrt{2n} }=-infty [/latex]