Question

Solve x2 - 12x + 5 = 0 by completing the square.

Which equation is used in the process?

(x - 6)2 = 31 ,
(x - 6)2 = 26 ,
(x - 6)2 = 19

Answer 1

first one

Answer 2

Subtract 5 from both sides.
x^2-12x = -5
Take 1/2 of 12 which is 6 and square it and add that to both sides.
x^2-12x+36=-5+36

Answer 3

(x-6)^2=31
Take the square root of both sides.
x-6=+-sqrt31
x=6+-sqrt31

Answer 4

So first choice