evagelos
Jun13-10, 08:14 PM
1. The problem statement, all variables and given/known data
Prove: xyzw\geq x+y+z+w-3,where x\geq 1,y\geq 1,z\geq 1,w\geq 1
2. Relevant equations
3. The attempt at a solution
The only thing i could try is to square both sides but then this leads nowhere.
Any ideas??
Prove: xyzw\geq x+y+z+w-3,where x\geq 1,y\geq 1,z\geq 1,w\geq 1
2. Relevant equations
3. The attempt at a solution
The only thing i could try is to square both sides but then this leads nowhere.
Any ideas??