Question

$x^{2} -2x-3=0$
помогите решить!

Answer 1

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