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Applied Optimization

5. Graphical Applications of Derivatives / Applied Optimization / 문제 3

문제 3

Determine the minimum sum $x plus 4 y$ for positive numbers $x$ and $y$ satisfying the equation $x y equals 18$ .

A

$2 the square root of 2$

B

$4 the square root of 2$

C

$6 the square root of 2$

D

$12 the square root of 2$