Помогите пж с квадратным уравнением !!! 1) 5x^2-2x-7=0 2) 11x^2=10x-1=0 3) 10x^2-9x-1=0 4) 30x^2=44x-10=0 Пажалуйстоооооооо !!!!!

1)Д=b²-4ac=4-4*5*(-7)=4+140=144    x₁=[latex] \frac{2- \sqrt{144} }{2*5} = \frac{2-12}{10} = \frac{-10}{10} =-1[/latex]    x₂=[latex] \frac{2+ \sqrt{144} }{2*5} = \frac{2+12}{10} = \frac{14}{10} =1.4[/latex] 2)D=100-4*11*(-1)=100+44=144 x₁=[latex] \frac{10-12}{2*11} = \frac{-2}{22} = \frac{-1}{11} [/latex] x₂=[latex] \frac{10+12}{2*11} = \frac{22}{22} =1[/latex] 3)D=81-4*10*(-1)=81+40=121 x₁=[latex] \frac{9-11}{2*10} = \frac{-2}{20} =-0.1[/latex] x₂=[latex] \frac{9+11}{2*10}= \frac{20}{20} =1[/latex] 4)D=1936-4*30*(-10)=1936+1200=3136 x₁=[latex] \frac{44-56}{2*30} = \frac{-12}{60} =-0.2[/latex] x₂=[latex] \frac{44+56}{2*30} = \frac{100}{60} =1 \frac{2}{3} [/latex]