1 задание срочно плииииииииизззз

[latex] x^{2} -4x+3=0[/latex] [latex]D =(-4)^2-4*1*3=16-12=4[/latex] [latex] x_{1} = \frac{4+2}{2} = \frac{6}{2} =3[/latex] [latex] x_{2} = \frac{4-2}{2} = \frac{2}{2} =1[/latex] ........................................ [latex] x^{2} +9x=0 [/latex] [latex]x(x+9)=0[/latex] [latex]x=0[/latex] или [latex]x+9=0[/latex] [latex]x=-9[/latex] ........................................ [latex]7 x^{2} -x-8=0[/latex] [latex]D=(-1)^2-4*7*(-8)=1+224=225[/latex] [latex] x_{1} = \frac{1+15}{14} = \frac{16}{14} = \frac{8}{7} [/latex] [latex] x_{2} = \frac{1-15}{14} = \frac{-14}{14} = -1[/latex]