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The Brainliest Answer!
  • Brainly User
2014-03-30T22:26:35+05:30
(x+y)^2=x^2+y^2+2xy=(10-xy)^2
29+2xy=100+x^2y^2-20xy
x^2y^2-22xy+71=0
take xy=a
a^2-22a+71=0
solve it
u can find that xy=3.9289  (the other value is grater than hence it is not possible)
therefore x+y=10-3.9289=6.071
2 5 2
how come xy=3.9289
using formula b-(b^2-4c)/2a
b=22 c=71 a=1
thanks
the formula is (b-(b^2-4ac)^0.5)/2