If x, y and z are real numbers such that: x + y + z = 5 and xy + yz + zx = 3, what is the largest value that x can have ?
(In reply to
solution by Charlie)
I agree with SK. If your substituted equation is right, then I get 5y + y(55y) + 5(55y)=3
This substitutes to 5y(y^2)5y=3, or y^2=3, which requires an imaginary value for 3.

Posted by Gamer
on 20031117 16:54:52 