[tex] x^{2} -2x-3=0[/tex]
помогите решить!

x^2 - 2x - 3 = 0 D = 4 + 4*3 = 4 + 12 = 16x1 = ( 2 + 4)/2 = 6 /2 = 3 ;x2 = ( 2 - 4)/2 = - 2/2 = - 1