SOLUTION: if x2+y2=85 and xy=9 what is (x+y)2 *the 2 behind means to the second power i couldn't get it 2 show properly

Algebra ->  Exponents -> SOLUTION: if x2+y2=85 and xy=9 what is (x+y)2 *the 2 behind means to the second power i couldn't get it 2 show properly      Log On


   

Question 547136: if x2+y2=85
and xy=9
what is (x+y)2
*the 2 behind means to the second power i couldn't get it 2 show properly
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
if x2+y2=85
and xy=9
what is (x+y)2
add 2xy to both sides


x^2+2xy+y^2=85+2xy
(x+y)^2= 85+2*9
(x+y)^2=103