[Norbas]

Hi there,

I have got a question to you all:



Differentiate this equation to determine the value of z₂/z₁ for which it is a maximum.

I see a few ways to approach it, but I have no answer to compare. Can anyone help me, please?

[Norbas]

Any help? I just want to know, how would you do it. Q,b,g treat as constants. Multiply both sides by z₁²? Then you differentiate constants, so you get 0. Then you differentiate the other side and you get something?

[kaosu_souzousha]

(Original post by Norbas)
Any help? I just want to know, how would you do it. Q,b,g treat as constants. Multiply both sides by z₁²? Then you differentiate constants, so you get 0. Then you differentiate the other side and you get something?

??

[Norbas]

Why z2/z1 = 2/3? How did you get this?

[darksky69]

you take z2/z1 as being your variable, call it x, the lhs of the equation is a constant, call it k:
so k=2x²-2x^3
Differentiate it and you'll get an answer.