Find all pairs of real numbers such that x + y = 10 and x^2 + y^2 = 56 - 2xy.
For example, to enter the solutions and , you would enter "(2,4),(-3,9)" (without the quotation marks).
+37159 Hmmmmmm....
x+y = 10 and (x+y)2 = 56 doesn't seem to have a solution.....am I missing something? 
