I'm trying to find the vertex form of a standard form quadratic equation through completing the square, and I'm using this page to try and get through it: http://www.purplemath.com/modules/sqrvertx.htm
in step 5, it says 'convert the right-hand side to squared form'. what is this? the site itself uses the term seven times but has no explanation of it, and I really can't follow how they combined what they had into the 'squared form'.
the equation I'm working with is $2(x^2+3x+2.25)=y+9.5$, but I'd like a general explanation that I could try to apply myself.
do note that I'm aware this question is probably really dumb, and I'm most likely missing something basic or it's just an alternate term for something I know.