## 688 Reputation

17 years, 93 days

## How do I redistribute the negative sign...

Maple

Occassionally when I simplify maple puts a negative sign out front.  How do I get maple to put it back in the equation?

Something like (3+4i)/(-3+7i)  When I simplify maple shows   -  (3+4i) / (-7i+3)

I'm really not sure why maple would factor out a (-1).   In any case how do I reverse it?

## The order of variables in an answer...

Maple

Is there a way for maple to display an answer with a set order?  or set it so it always does it a certain way.

As an example, lets take eq1:=a=(v-vo)/t then solve(eq1,{v});  (I put the v in {} so the answer will display the full equation).  Without the {} it only displays the answer.  Anyways, the answer returned is {v=a*t+vo

I would like to manipulate it so that maple will always display an equation with a single variable first.  So, for in our example I would like it shown as  v=vo+a*t

## something simple...

Maple

Basically if we have a:=x^2 and I subs(x=b/c,a) we get b^2/c^2.

How do I get maple to display it as (b/c)^2?

## Common denominator problem...

Maple

Why can I not get a common denominator from a/2+b/3?  Maple returns 1/2*a + 1/3*b and not (3a+2b)/6.  Normal(a/2+b/3) returns the same equation.

If I simplify(a/b+b/c) I get (a*c+b^2)/(b*c) but doesn't seem to work right with numbers in there.

## Need a little help...

Maple

Okay, I'm just starting to get the hang of Maple and I'm going through a tutorial that has a problem in it I'm having a little difficulty setting up.

A charged disk of radius a having uniform charge density "sigma" (the actual symbol sigma) produces and electric field Ez along the z-axis given by the integral expression (I'll do the best I can to illustrate it here)

Ez(z) =  (sigma * z * int ( r/((r^2+z^2)^(3/2)) ,r=0..a))/(2*epsilon0)

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