Let's see how well I remember this one...

Ok, so we reorganize the equation:

So we want to complete the squares for the x terms. Take the -2x term and divide by 2 (so, -1) and square that (thus, 1). That is the number you need to complete the square. Do this:

Note that I added the +1 to the right side as well!

So now we can easily factor , leaving us with:

.

Voila, square completed. You'll probably want to reorganize the equation a bit into the standard form:

Can you take it from there?