$Q ( x , y ) = 3 x y ^ { 3 }$ is the daily production for x skilled and y unskilled workers. What is the exact change in daily production if x changes from 4 to 3 and y from 2 to 1?

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The Answer of $Q ( x , y ) = 3 x y ^ { 3 }$ is the daily production for x skilled and y unskilled workers. What is the exact change in daily production if x changes from 4 to 3 and y from 2 to 1?

Q(x,y)=3xy3Q ( x , y ) = 3 x y ^ { 3 }Q(x,y)=3xy3

$Q ( x , y ) = 3 x y ^ { 3 }$