normally an equation with the x value squared there would be two roots.
the two roots are positive 1 and postitive 1. since they are they same number there is actually only one root.
Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. It is therefore impossible to give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "times", "equals", "squared" etc. I suspect there should be a symbol between x2 and 2x but cannot be sure what it might be.
Let there be x pupils in the class.Total increase in marks =x x1=x22x= (83 - 63) x= 20 x= 40.22