Решите уравнение х^2-2х-1=16

Xˇ2-2x-1=16 xˇ2-2x-17=0, D=4+68=72=36.2,VD=V(36.2)=6.V2 x1=1/2(2+6V2)=1+3V2 x2=1/2(2-6V2)=1-3V2