[tex]x^{2} -x-6=0 a=1 b=-1 c=-6 Delta= b^{2}-4ac=1+24=25 \left \{ {{x1=-b+\sqrt{delta} totul supra 2 = (1+5):2= 3} \atop {x2= -b - \sqrt{delta} }totul supra 2=(1-5):2=2} \right.[/tex]
