решите 3 квадратных уравнения 6x^2+7x-3=0 20x^2+26x-6=0 3x^2-19x-14=0
6x^2+7x-3=0 Д=49+72=121 √Д=11 х1=(-7+11)/12=1/3 х2=(-7-11)/12=-1.5 ___________________ 20x^2+26x-6=0 Д=676+480=1156 √Д=34 х1=(-26+34)/40=8/40=0,2 х2=(-26-34)/40=-1.5 ____________________ 3x^2-19x-14=0 Д=361+168=529 √Д=23 х1=(19+23)/6=7 х2=(19-23)/6=2/3
6x^2+7x-3=0 Д=49+72=121 √Д=11 х1=(-7+11)/12=1/3 х2=(-7-11)/12=-1.5 ___________________ 20x^2+26x-6=0 Д=676+480=1156 √Д=34 х1=(-26+34)/40=8/40=0,2 х2=(-26-34)/40=-1.5 ____________________ 3x^2-19x-14=0 Д=361+168=529 √Д=23 х1=(19+23)/6=7 х2=(19-23)/6=2/3