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Find the Point at Which the Function f(x,y,z)=2x+y2zf ( x , y , z ) = 2 x + y - 2 z

Question 2

Multiple Choice

Find the point at which the function f(x,y,z) =2x+y2zf ( x , y , z ) = 2 x + y - 2 z has the maximum value subject to the constraint that x2+y2+z2=4x ^ { 2 } + y ^ { 2 } + z ^ { 2 } = 4 .


A) (43,23,43) \left( \frac { 4 } { 3 } , \frac { 2 } { 3 } , \frac { 4 } { 3 } \right)

B)
(43,23,43) \left( \frac { 4 } { 3 } , \frac { 2 } { 3 } , - \frac { 4 } { 3 } \right)
C) (43,23,43) \left( \frac { 4 } { 3 } , - \frac { 2 } { 3 } , \frac { 4 } { 3 } \right)
D) (43,23,43) \left( \frac { 4 } { 3 } , - \frac { 2 } { 3 } , - \frac { 4 } { 3 } \right)
E) (43,23,43) \left( - \frac { 4 } { 3 } , - \frac { 2 } { 3 } , \frac { 4 } { 3 } \right)
F) (43,23,43) \left( - \frac { 4 } { 3 } , - \frac { 2 } { 3 } , - \frac { 4 } { 3 } \right)

G) (43,23,43) \left( - \frac { 4 } { 3 } , \frac { 2 } { 3 } , - \frac { 4 } { 3 } \right)

H) None of these

Correct Answer:

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