Solve an equation as a fraqtion. Is it possible?
11-02-2018, 08:42 AM (This post was last modified: 11-02-2018 08:44 AM by blevita.)
Post: #1
 blevita Junior Member Posts: 29 Joined: Jun 2018
Solve an equation as a fraqtion. Is it possible?
Hi

I would like to solve a simple equation to two variables.
This is obvious a very simple task for the attached example but as you could imagine, i would like to do the same with much more complex equations.

So my question is, is it possible to solve such an equation to a fraqtion which consists of two variables?
I have tried with solve(...,[x/b]) but i got only an empty result.

If the prime is not able to do so, is there any othe tool out there who can do such a algebraic operation?

Thanks

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11-02-2018, 10:40 AM
Post: #2
 ndzied1 Member Posts: 102 Joined: Apr 2014
RE: Solve an equation as a fraqtion. Is it possible?
The CAS is where you would do this

11-02-2018, 11:33 AM
Post: #3
 Aries Member Posts: 157 Joined: Oct 2014
RE: Solve an equation as a fraqtion. Is it possible?
(11-02-2018 08:42 AM)blevita Wrote:  Hi

I would like to solve a simple equation to two variables.
This is obvious a very simple task for the attached example but as you could imagine, i would like to do the same with much more complex equations.

So my question is, is it possible to solve such an equation to a fraqtion which consists of two variables?
I have tried with solve(...,[x/b]) but i got only an empty result.

If the prime is not able to do so, is there any othe tool out there who can do such a algebraic operation?

Thanks

Hi,
you have to use the CAS ambient in order to do that
Best,

Aries
11-02-2018, 04:24 PM
Post: #4
 blevita Junior Member Posts: 29 Joined: Jun 2018
RE: Solve an equation as a fraqtion. Is it possible?

But its not what i have searched for ^^.
The problem is, that in my case, the "a"-part is not that simple.

I think i must give you the real example.

This is my equation:
((r1*r3*u2+r2*r3*u1)/(c2*p*r1*r2*r3+r1*r2+r1*r3+r2*r3)) = (-u2*p*c1*r3)

I want to know what u2/u1 is.
Therefore i have tried to do this:

solve(((r1*r3*u2+r2*r3*u1)/(c2*p*r1*r2*r3+r1*r2+r1*r3+r2*r3)) = (-u2*p*c1*r3),[u2/u1])

but it does not work
11-02-2018, 05:31 PM
Post: #5
 Aries Member Posts: 157 Joined: Oct 2014
RE: Solve an equation as a fraqtion. Is it possible?

But its not what i have searched for ^^.
The problem is, that in my case, the "a"-part is not that simple.

I think i must give you the real example.

This is my equation:
((r1*r3*u2+r2*r3*u1)/(c2*p*r1*r2*r3+r1*r2+r1*r3+r2*r3)) = (-u2*p*c1*r3)

I want to know what u2/u1 is.
Therefore i have tried to do this:

solve(((r1*r3*u2+r2*r3*u1)/(c2*p*r1*r2*r3+r1*r2+r1*r3+r2*r3)) = (-u2*p*c1*r3),[u2/u1])

but it does not work

I got it … I think the argument has to be a variable name …
Best,

Aries
11-02-2018, 09:08 PM (This post was last modified: 11-02-2018 09:21 PM by rushfan.)
Post: #6
 rushfan Junior Member Posts: 22 Joined: May 2017
RE: Solve an equation as a fraqtion. Is it possible?

But its not what i have searched for ^^.
The problem is, that in my case, the "a"-part is not that simple.

I think i must give you the real example.

This is my equation:
((r1*r3*u2+r2*r3*u1)/(c2*p*r1*r2*r3+r1*r2+r1*r3+r2*r3)) = (-u2*p*c1*r3)

I want to know what u2/u1 is.
Therefore i have tried to do this:

solve(((r1*r3*u2+r2*r3*u1)/(c2*p*r1*r2*r3+r1*r2+r1*r3+r2*r3)) = (-u2*p*c1*r3),[u2/u1])

but it does not work

Try:

Code:
solve(((r1*r3*u2+r2*r3*u1)/(c2*p*r1*r2*r3+r1*r2+r1*r3+r2*r3)) = (-u2*p*c1*r3), u2) Ans/u1 simplify(Ans)
11-02-2018, 10:09 PM
Post: #7
 ijabbott Senior Member Posts: 950 Joined: Jul 2015
RE: Solve an equation as a fraqtion. Is it possible?

But its not what i have searched for ^^.
The problem is, that in my case, the "a"-part is not that simple.

I think i must give you the real example.

This is my equation:
((r1*r3*u2+r2*r3*u1)/(c2*p*r1*r2*r3+r1*r2+r1*r3+r2*r3)) = (-u2*p*c1*r3)

I want to know what u2/u1 is.
Therefore i have tried to do this:

solve(((r1*r3*u2+r2*r3*u1)/(c2*p*r1*r2*r3+r1*r2+r1*r3+r2*r3)) = (-u2*p*c1*r3),[u2/u1])

but it does not work

Replace u2 with u1*x and solve for x.

— Ian Abbott
11-02-2018, 10:32 PM
Post: #8
 blevita Junior Member Posts: 29 Joined: Jun 2018
RE: Solve an equation as a fraqtion. Is it possible?
Thank you very much!
I think i got it

I love the HP-Forum.
And i love my HP-Calc.
He is much better than my old TI-NSpire. ^^
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