Find the extremum of​ f(x,y) subject to the given​ constraint, and state whether it is a maximum or a minimum.   f(x,y,z)=x^2+y^2+z^2; 2x+4y-4z=72

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter11: Topics From Analytic Geometry
Section11.1: Parabolas
Problem 36E
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Find the extremum of​ f(x,y) subject to the given​ constraint, and state whether it is a maximum or a minimum.
 
f(x,y,z)=x^2+y^2+z^2;
2x+4y-4z=72
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