(x^(2)+y^(2)+z^(2)-64)/(y-yz-z)=-2" and "x+y=3z" ,then value of "z" is: "

If (x^(2)+y^(2)+z^(2)-64)/(xy-yz-zx)=-2 and x+y=3z, then the value of z is (a) 2 (b) 3 (c) 4 (d) None of these

If x,y and z satisfy given system of given equations: x^(2)+y^(2)+z^(2)=133,y+z-x=7,yz=x^(2) then the value of x+y+z is

If x^(3) + y^(3) + z^(3) = 3xyz and x + y + z = 0 , find the value of : ((x+y)^(2))/(xy) + ((y+z)^(2))/(yz) + ((z+x)^(2))/(zx)

If x and y and z satisfy the given system of equations x^(2)+y^(2)+z^(2)=133,y+z-x=7,yz=x then the 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 x+y+z =10 , x^(2) +y^(2) +z^(2) =60 then value of xy+yz +zx is

If x+y -z = 4 and x^(2) + y^(2) + z^(2) = 30 , then find the value of xy- yz- zx