Question

so for this one, find the derivative again?

and get.....

attached inside :)

Answer 1

r=______

Answer 2

and \[f ' (r)=\frac{ 2ar-3b }{ r^{4} }\]

Answer 3

@ganeshie8 ?

Answer 4

set equal to zero?

multiply both sides by r^4

2ar-3b = 0

solving for r?

2ar = 3b

r=3b/2a

?? is that right? did i get the right answer with the right steps? haha :P

Answer 5

though i'm a bit thrown off by the r^3' :/

Answer 6

You're right