- #1
evagelos
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Homework Statement
Prove: xyzw[tex]\geq x+y+z+w-3[/tex],where [tex]x\geq 1,y\geq 1,z\geq 1,w\geq 1[/tex]
Homework Equations
The Attempt at a Solution
The only thing i could try is to square both sides but then this leads nowhere.
Any ideas??