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From: Mohammed Forhad on 2 Jul 2010 02:55
hi !
I am new in this group.

How to get the value of x
1. Solve[a[1-b]x+abs-sqrt[x^b]c==0,x]
2. Solve[[alog[x]+b+a-[s+t]a/x-a/x[1/[alog[x]+b]hf]==0,x]
3. Plot[[alog[x]+b+a-[s+t]a/x-a/x[1/[alog[x]+b]hf],{x,1,10}]

Further , what does it mean: Out[6]= -Graphics-

Please help me
Uddin

From: Peter Pein on 3 Jul 2010 08:18
Am Fri, 2 Jul 2010 06:55:36 +0000 (UTC)
schrieb Mohammed Forhad <kforhad77(a)gmail.com>:

> hi !
> I am new in this group.
>
> How to get the value of x
> 1. Solve[a[1-b]x+abs-sqrt[x^b]c==0,x]
> 2. Solve[[alog[x]+b+a-[s+t]a/x-a/x[1/[alog[x]+b]hf]==0,x]
> 3. Plot[[alog[x]+b+a-[s+t]a/x-a/x[1/[alog[x]+b]hf],{x,1,10}]
>
> Further , what does it mean: Out[6]= -Graphics-
>
> Please help me
> Uddin
>

regarding 1.: how are the functions a and sqrt defined by you?
2.: how is alog defined? What is the function without name called with
parameter s+t an later with alog[x]+b? How is the function x defined?
3.: again a function without name, alog and x[..]

If you do not tell us, how you defined the mentioned functions (the one
without a name will not work at all), we can not help you.

Sorry,
Peter.

P.S.: Mathematica comes _with_ documentation. Select "Help" from the
menu, then "Virtual book" and read and work through the first few
chapters.


From: Bob Hanlon on 3 Jul 2010 08:16

First, learn and use the proper syntax

1. The expression cannot be solved in general; however, if b is known

Table[Solve[a (1 - b) x + a b s - Sqrt[x^b] c == 0, x],
{b, 0, 3}]

2. Not all equations can be solved (either by Solve or Reduce). It may require numerical techniques with values assigned to variables

expr = a Log[x] + b + a - (s + t) a/x - a/x (1/(a Log[x] + b) h f);

With[{a = 1, b = 2, s = 3, t = 4, h = 5, f = 6},
FindRoot[
a Log[x] + b + a - (s + t) a/x - a/x (1/(a Log[x] + b) h f),
{x, 1}]]

{x->3.72103}

3. To plot an expression it must be numeric, i.e., there can be no variables that are not assigned a value.

With[{a = 1, b = 2, s = 3, t = 4, h = 5, f = 6},
Plot[
a Log[x] + b + a - (s + t) a/x - a/x (1/(a Log[x] + b) h f),
{x, 1, 10}]]


Bob Hanlon

---- Mohammed Forhad <kforhad77(a)gmail.com> wrote:

=============
hi !
I am new in this group.

How to get the value of x
1. Solve[a[1-b]x+abs-sqrt[x^b]c==0,x]
2. Solve[[alog[x]+b+a-[s+t]a/x-a/x[1/[alog[x]+b]hf]==0,x]
3. Plot[[alog[x]+b+a-[s+t]a/x-a/x[1/[alog[x]+b]hf],{x,1,10}]

Further , what does it mean: Out[6]= -Graphics-

Please help me
Uddin


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