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- bobbym
- 2012-11-29 08:45:05
Could just be a sign change. Let me see your answer.
- 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.