Question

Find the minimum average cost if the total cost function is
C(x) = 7 x^2 + 5 x + 12 .

Answer 1

http://openstudy.com/study?login#/updates/4fa5c518e4b029e9dc35ad58

Answer 2

you would find the vertex

Answer 3

to find the minimum cost

Answer 4

yeh that would be -5/14 but that incoreect

Answer 5

anyone else plz

Answer 6

One way to do this would be to get the derivative of the equation. Once you have it, search for critical points, if that's the correct term.

You will then set derivative = 0 and Find at what point there is a sign change.

Answer 7

critical pt is -5/14

Answer 8

I see, I just realized that. Well now that you have that, you plug that in for your "x" in your original equation. and that should give you the lowest cost.

Answer 9

tnx

Answer 10

no problem

Answer 11

actually you have to find average cost and then take derivative of that and then find critical pt and substitute the vale in the Average cost formula not the original cost

Answer 12

but tnx for the idea btw

Answer 13

but tnx for the idea btw

Answer 14

Oh, the problem did state to find the average, I had missed that. Glad you caught it.

Answer 15

I am curious though, how would you find the average cost formula?