It says to complete the square for x^2-4x-2=0

Question

How do you do this? Please help.

Answer 1

x^2 - 4 x = 2
(4/2)^2 = 4

x^2 - 4 x + 4 = 2 + 4

(x-2)^2 = 6

x = 2 +/- sqrt(6)