Question 872498
The choices are not shown.  The term to complete the square is 9, which is {{{(-6/2)^2}}}.   Add and subtract 9 on the left side, regroup and factor the appropriate trinomial portion into a square binomial, and them simplify the entire left side.


{{{x^2-6x+9-9-9=0}}}
{{{(x-3)^2-18=0}}}