372

a)
$6x^2-x-2$
$x=\frac{1\pm7}{12}=\frac{2}{3}\ tai\ -\frac{1}{2}$
$6\left(x-\frac{2}{3}\right)\left(x+\frac{1}{2}\right)$
b)
$10x^2+x-3$
$x=\frac{-1\pm11}{20}=\frac{1}{2\ }\ tai\ -\frac{3}{5}$
$10\left(x-\frac{1}{2}\right)\left(x+\frac{3}{5}\right)$