Question 135384
x^2-2x-9=0
x^2-2x  =9
x^2-2x+1=9+1 comleting the square by dividing the middle term by 2 and squaring it and  last term.
(x-1)^2=10
x-1=+-sqrt(10) sqrt of each side.
x=1+-sqrt(10)
.
Ed