x²-6x-1=0
x²-6x=1
x²-6x+9=1+9=10
(x-3)²=(±√10)²
x-3=±√10
x1=3+√10,x2=3-√10
|√27-6√(1/3)-2√3|
=|3√3-(6/3)√3-2√3|
=|3√3-2√3-2√3|
=|-√3|
=√3