SOLUTION: If x+y=6, xy=9, then x2+y2 is equal to_____?

Algebra ->  Equations -> SOLUTION: If x+y=6, xy=9, then x2+y2 is equal to_____?      Log On


   

Question 479633: If x+y=6, xy=9, then x2+y2 is equal to_____?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
(x+y)=6
xy=9
(x+y)^2=36
x^2+2xy +y^2=36
xy =9
x^2+18+y^2=36
x^2+y^2=36-18
x^2+y^2=18
m.ananth@hotmail.ca