If a,y and z are real numbers such that `x^2 + y^2 + 2 z^2 = 4x - 2z + 2yz - 5`, then the possible value of (x-y-z) is :

If a,y and z are real numbers such that x^(2)+y^(2)+2z^(2)=4x-2z+2yz-5, then the possible value of (x-y-z) is :

If the real numbers x, y, z are such that x^2 + 4y^2 + 16z^2 = 48 and xy + 4yz + 2zx = 24 . what is the value of x^(2) +y^(2) z^(2) =?

If x,y,z are positive real numbers such that x^(2)+y^(2)+Z^(2)=7 and xy+yz+xz=4 then the minimum value of xy is

If x,y,z are positive real numbers such that x^(2)+y^(2)+Z^(2)=7 and xy+yz+xz=4 then the minimum value of xy is

If x,y,z are positive real numbers such that x^(2)+y^(2)+Z^(2)=7 and xy+yz+xz=4 then the minimum value of xy is