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? ?->(Show Answer!)

1. 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?

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By: anil on 05 May 2019 02.30 am

The given equations are x + y + z = 5 -- (1) , xy + yz + zx = 3 -- (2)
xy + yz + zx = 3
x(y + z) + yz = 3
=> x ( 5 -x ) +y ( 5 - x - y) = 3
=> $$ - y^2 - y (5 -x) - x ^2 + 5x = 3$$
=> $$ -y^2 + y (x-5) + ( x ^2 - 5x +3) = 0 $$
The above equation should have real roots for y, => Determinant >= 0
=> $$ ( x - 5)^2 - 4(x ^2 - 5x +2 ) geq 0$$
=> $$ 3x^2 -10x - 13 leq 0$$
=> $$ -1 leq x leq frac{13}{3}$$
Hence maximum value x can take is $$frac{13}{3}$$, and the corresponding values for y,z are $$frac{1}{3},frac{1}{3}$$

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