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Thanks for the replies everyone! I got this first time round: 5a(3b+2a)-a(2a+3c) = 15ab + 10a² - 2a² + 3ac = 15ab + 3ac + 8a² I typed "simplify 5a(3b+2a)-a(2a+3c)" into wolfram and got: 8a² + 15ab - 3ac So I see where I went wrong - easy to lose a sign when you're not used to them (that's my excuse anyway). I installed Maxima for kicks as it looks great for all sorts of things I have incoming, but I don't really get the input system just yet, I'm just getting an error "Syntax error: A is not an infix operator", so I'll stick with wolfram for now and get a better look at Maxima when I'm less pressed for time. -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html