- #1
FightingWizard
- 7
- 0
Homework Statement
Let P be the set of (x,y,z)^t in R^3, which satisfies the following inequalities:
-2x+y+z <=4
x-2y+z<=1
2x+2y-z<=5
x>=1
y>=2
z>=3
Homework Equations
I want to find the vector in the set with the maximal length.
The Attempt at a Solution
I have transformed the linear inequalities into matrix form:
(2 -1 -1 -4)
(-1 2 -1 -1)
(-2 -2 1 -5)
I solved it using Gauss elimination and got x = 2, y = 3 and z = 5, which satisfies the linear inequalities.
To find the length of the vector I did : sqr(2^2+3^2+5^2) = sqrt(38), which was my answer.
My instructor says that my solution is not correct. Can anyone help me?