TheWeekndLuv
New member
- Joined
- Sep 18, 2013
- Messages
- 6
Okay so I have the function C= 7(sqrtI3+5)/(I+11), Now to find marginal propensity I have to take the derivative in which I can use the quotient rule. Now when I do so it wants me to find marginal propensity at I = 121. I dont get what im doing wrong??? I know I can take out the 7 and multiply it last.
C' = 7 ((I+11)(I3/2+5)'-(I3/2+5)(I+11)')/(I+11)2
= 7(I+11)((3/2)I1/2)-(I3/2+5)(1)/(I+11)2
= 7(121+11)(16.5)-(1336)/(132)2
= 13910/17424
But my answer is still wrong :/ Will someone help me out please!! Thank you!!
C' = 7 ((I+11)(I3/2+5)'-(I3/2+5)(I+11)')/(I+11)2
= 7(I+11)((3/2)I1/2)-(I3/2+5)(1)/(I+11)2
= 7(121+11)(16.5)-(1336)/(132)2
= 13910/17424
But my answer is still wrong :/ Will someone help me out please!! Thank you!!