x_1=-2006; \ x_2=1" alt=" x^{2} +2x-195=0 \\ D=4+4*195=784=28^2 \\ x_{1,2}= \frac{-2 \pm 28}{2} \\ x_1=-15; \ x_2=13 \\ \\ 3 x^{2} -7x+2=0 \\ D=49-4*3*2=25=5^2 \\ x_{1,2}= \frac{7 \pm 5}{6} \\ x_1=2; \ x_2=1/3 \\ \\ x^{2} +2005x-2006=0 \\ x_1*x_2=-2006 \\ x_1+x_2=-2005 \\ =>x_1=-2006; \ x_2=1" align="absmiddle" class="latex-formula">
