I have the equation 1/2(x-3)^2-18 Now normally I have no trouble with expansion of brackets but for some reason this is puzling to me. 1/2x^2-3x-9-18 I get 1/2x^2-3x-27 I checked the answer with a maths package and it comes up with : - 1/2x^2-3x-27/2 Why? What am I missing here. where does the 27/2 come in? I also get 1/2(x-3)(x-9) if I factorise it again? My pacckage obviously likes, multiple different factorisations. Anyway I'm a bit stumped, normally I don't have a problem with this sort of straightforward stuff but I'm stumped on this one?