Can you more detailed explain and write this part :  Cost is minimized at the point where profit is maximized .  Profit = R -  C =  q2+14q+20 - 2q2 +  8q - 15 Profit maximizing point :  d(Profit )/dq  = 0 =>  -2q + 22 = 0 ( especially i don't understand this part !!!!) q* =  11    (Cost minimizing level of production  )

ENGR.ECONOMIC ANALYSIS
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Chapter1: Making Economics Decisions
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Can you more detailed explain and write this part : 

Cost is minimized at the point where profit is maximized . 

Profit = R -  C =  q2+14q+20 - 2q2 +  8q - 15

Profit maximizing point :  d(Profit )/dq  = 0

=>  -2q + 22 = 0 ( especially i don't understand this part !!!!)

q* =  11    (Cost minimizing level of production  ) 

 

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