Thank you Colin, that's a good feedback. For me, it's not clear which is the simplest, between x(x+54) And x^2+54x Now, it's true that I don't take

Thank you Colin, that's a good feedback. For me, it's not clear which is the simplest, between x(x+54) And x^2+54x Now, it's true that I don't take into account the orders of polynoms and don't display the product right (for my program, 54x is just like x54). Also I need a symbol for a product to be able to simplify expressions like: 2*x + 3*x (You would grab the first member by the product sign). On the website I submitted I have other exercises with a free input, where you enter directly the solution, but I think it's boring to have to enter the whole answer in one go. > If it were clearer what was the target then it might be better The target should be reformulated to something like "rewrite the following expression into a sum of monoms."