test

$$ x{1} + x{2} = - \frac{b}{a} $$

$$ x_1 + x_2 = - \frac{b}{a} $$

$$ \lim {x \rightarrow \infty} \frac{a{n} x^{n}+a{n-1} x^{n-1}+\ldots+a{1} x+a{0}}{b{m} x^{m}+b{m-1} x^{m-1}+\ldots+b{1} x+a{0}} = \left{\begin{array}{ll}
\frac{a{n}}{b_{m}}, & n = m \
0, & n<m \
\infty, & n>m
\end{array}\right. $$