321

a)
$2x^2+3x+1=0$
$x=-\frac{-3\pm\sqrt{3^2-4\cdot2\cdot1}}{2\cdot2}$
$x=\frac{-3\pm\sqrt{1}}{4}=\frac{-3\pm1}{4}$
$x=\frac{-4}{4}=-1\ tai\ x=\frac{-2}{4}=-\frac{1}{2}$
$summa\ on\ -\frac{b}{a}=-\frac{3}{2}{,}\ eli\ -1+\left(-\frac{1}{2}\right)$
$tulo\ on\ \frac{c}{a}{,}\ \frac{1}{2}eli\ -1\cdot\left(-\frac{1}{2}\right)=\frac{1}{2}$
b)
$summa\ -\frac{3}{2}=-1\ \frac{1}{2}{,}\ tulo\ \frac{7}{2}=3\ \frac{1}{2}$