[tex] x^{2} -3x+2=0[/tex]
Δ=[tex] b^{2} -4ac[/tex]
Δ=9-(4*1*2)=9-8=1
[tex] x_{1} = \frac{-b+ \sqrt{delta} }{2a} [/tex]
[tex] x_{1} = \frac{3+1}{2} = \frac{4}{2} =2[/tex]
[tex] x_{2} = \frac{-b- \sqrt{delta} }{2a} [/tex]
[tex] x_{2} = \frac{3-1}{2} = \frac{2}{2} =1 [/tex]
