The Weekly Output for a Manufacturer Is $Q ( x , y ) = 12 x + 50 y - 2 x ^ { 2 } + y ^ { 2 }$

Short Answer

The weekly output for a manufacturer is $Q ( x , y ) = 12 x + 50 y - 2 x ^ { 2 } + y ^ { 2 }$ units. Use marginal analysis to estimate the change in weekly output as a result of changing x from 20 to 21 while y remains constant at 10.