Answers

2016-04-21T22:04:03+05:30
Assumption:
x^2+y^2=25xy

2\log(x+y)=\log(x+y)^2\\3\log3+\log{x}+\log{y}=\log3^3+\log{x}+\log{y}=\log(27xy)
For  x + y > 0  and  xy > 0   we have:
(x+y)^2=27xy\\x^2+y^2+2xy=27xy\\x^2+y^2=25xy
What was written in the assumption.
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