The cost C (in dollars) of building a house is related to the number k of carpenters used and the number e of electricians used by the formula†
C = 15,000 + 50k2 + 60e2.
If the cost of the house is fixed at $100,000, find
dk/de

e = 15

Question

The cost C (in dollars) of building a house is related to the number k of carpenters used and the number e of electricians used by the formula†
C = 15,000 + 50k2 + 60e2.
If the cost of the house is fixed at $100,000, find
dk/de
	 
e = 15

gorv · Answer

thn our function will be 
100000=15000+50k^2+60e^2

gorv · Answer

subtracting 15000 from both side 
100000-15000=50k^2+60e^2
now differentiate  with respect to e