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Sep 17, 2014 at 14:04 comment added eldo Quote from @belisarius comment:" ... Impossible to foresee using algebra only." Using his comment you can see the common parts but then, again, you have to make your choice.
Sep 17, 2014 at 13:58 comment added Romain Replacing is easy when I know the common parts. But I want Mathematica to tell me that I should define a variable equals to Sqrt[b^2-4ac].
Sep 17, 2014 at 13:41 history answered eldo CC BY-SA 3.0