Confused how you get from step 1 to step 2
I don't understand how you get the -7 from x^2-2x
Ok. That makes more sense now. Your first step is fine, although I would probably leave the 7 on the RHS. Different people complete the square in different ways.
. I pulled the 2x over to the LHS.
. I added the square of half the coefficient of the x term to both sides. Then you get
. From here, it looks as though you've solved the rest of the problem.