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bobbym
2012-11-29 08:45:05

BarandaMan
2012-11-29 08:37:25

#### bobbym wrote:

You mean on the step I just did or on the final answer?

On the step you just did

bobbym
2012-11-29 08:33:18

You mean on the step I just did or on the final answer?

BarandaMan
2012-11-29 08:28:48

I know we are not done, but on the expression you just posted for qh.... at the bottom you have b(u-3) and I get b(3-u), this is what I am talking about.

bobbym
2012-11-29 08:25:25

You should notice that I have a q^L in the partial answer. That is because it is not done yet.

BarandaMan
2012-11-29 08:17:11

I know, but on the thing you posted, the denominator you got ub-3b and I have 3b-ub

bobbym
2012-11-29 08:12:47

Hi;

No, we are not done yet. I just solved for q^H, it is not the final answer.

BarandaMan
2012-11-29 08:06:51

Shouldn't it be 3b-ub on the bottom ?

bobbym
2012-11-29 08:00:04

Hi;

You do not need to copy my posts. It is not necessary and it is extra work.

Take the first equation and solve for q^H. You get:

BarandaMan
2012-11-29 07:53:54

Ok thanks I got the same as you when I just expanded this.

bobbym
2012-11-29 07:45:48

Same thing here, we both used a computer but I will show you how you might do it by hand.

Start by expanding the 2 equations,

BarandaMan
2012-11-29 07:41:12

#### bobbym wrote:

First I must ask a question:

If you saw this in a book,

would you ask someone how they did it by hand?

No of course not! I would use a calculator!

But do you see what I mean? It is not the solution, but I am really bad at substituting/manipulating the formulas in the way required, so this is a real chance for me to see the method used. There was a lot before that step to get to those two equations, then the 'answer' is to express them in terms of qh and ql. However, I cannot do that and really need help. Will you not help me? I just cannot rearrange/manipulate.

bobbym
2012-11-29 07:08:58

First I must ask a question:

If you saw this in a book,

would you ask someone how they did it by hand?

BarandaMan
2012-11-29 07:05:50

#### bobbym wrote:

I didn't get a solution to it. Just because you see an answer in a book that does not mean the author worked it out.

But were you able to rearrange/substitute the top two equations to get the same expressions as those posted?

It is not the answer, but that is what I cannot do, I cannot rearrange them. I really want to do it...please help me? Does it make sense?

bobbym
2012-11-29 06:38:39

I didn't get a solution to it. Just because you see an answer in a book that does not mean the author worked it out.