SOLUTION: How may i prove this using direct proof? Let x,y be real numbers. {{{ x^2+y^2 >= 2xy }}} Please help!! thank you!

SOLUTION: How may i prove this using direct proof? Let x,y be real numbers. {{{ x^2+y^2 >= 2xy }}} Please help!! thank you!

Algebra.Com

Question 1020219: How may i prove this using direct proof?
Let x,y be real numbers.

Please help!!
thank you!
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
For all real numbers x, y, it is always true that

Expanding the left side of the inequality,

==> after transposition.
And the statement is proved.
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