Question

Maximum value of derivatives?

Answer 1

http://gyazo.com/50082049bd200fcb680ed1caef1d6ab2 only need help with the last part

Answer 2

JK I got it

Answer 3

Whats the minimum..

Answer 4

It's just when the deriv equals zero, but 550/a, would it not be zero?

Answer 5

But it says zero is wrong.. lol:( and it says there is a minimum value

Answer 6

I think part © is asking for the maximum of N(a), which occurs when N'(a)=0
550/a = 0
if we invert both sides
a/550 = 1/0
a is undefined... there is no maximum value

Answer 7

Right, that's what I got but now for the minimum I'm lost.

Answer 8

a minimum also occurs at N'(a)=0 or at the boundary i.e. when a=1
we can ignore the N'=0 (there is no a)
so evaluate N(a) at a=1

Answer 9

1800:O Got ya