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Solve the Problem f(x,y,z)=x2+y2+z2f ( x , y , z ) = x ^ { 2 } + y ^ { 2 } + z ^ { 2 }

Question 250

Multiple Choice

Solve the problem.
-Find the extreme values of f(x,y,z) =x2+y2+z2f ( x , y , z ) = x ^ { 2 } + y ^ { 2 } + z ^ { 2 } subject to 3xy+z=63 x - y + z = 6 and x+2y+2z=2x + 2 y + 2 z = 2 .


A) Maximum: none; minimum: 14845\frac { 148 } { 45 } at (7445,2045,2845) \left( - \frac { 74 } { 45 } , \frac { 20 } { 45 } , \frac { 28 } { 45 } \right)
B) Maximum: none; minimum: 14845\frac { 148 } { 45 } at {7445,2045,2845) \left\{ \frac { 74 } { 45 } , \frac { 20 } { 45 } , - \frac { 28 } { 45 } \right)
C) Maximum: none; minimum: 14845\frac { 148 } { 45 } at {7445,2045,2845) \left\{ \frac { 74 } { 45 } , - \frac { 20 } { 45 } , \frac { 28 } { 45 } \right)
D) Maximum: none; minimum: 14845\frac { 148 } { 45 } at {7445,2045,2845) \left\{ \frac { 74 } { 45 } , - \frac { 20 } { 45 } , - \frac { 28 } { 45 } \right)

Correct Answer:

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