equation

[grohnheit]

hey.

I have just installed v13, but all the help and guide just confuse me.

I have to solve this equation: 3x (4x-1)-4x(2x-3)-1=5+2x(2x+3)

Could someone please make a mini guide where to whrite waht.

sry for my bad english.

 

[zdas04]

If you are trying to solve for x then use [cntl}= for the equal sign. Then highlight the x and hit symbolics, variable, solve. It gives you a "2" if I typed your equation correctly.

David

 

[grohnheit]

Sry, but I still do not understand.

I have v14 installed.

I click new and then choose blank worksheet.

then i start to enter the equation, but when I hit = it comes with a fail, that says this variable is undefined and it higligt the x.

I have a danish keyboard, so when I hit (Ctrl) + (=)it makes a equal or less symbol.

what do I wrong ?

 

[wfn217]

Type x=root(3x (4x-1)-4x(2x-3)-1-(5+2x(2x+3)),x). Then type x=

 

[wfn217]

You have to make ann initial guess at x before this.

 

[grohnheit]

http://img137.imageshack.us/my.php?image=helpth5.jpg

I do something wrong...

 

[zdas04]

Sounds like a problem with MathCAD understanding the Danish keyboard. You probably want to take this discussion to the MathCAD collaboratory

http://collab.mathsoft.com/~Mathcad2000

they may be able to help.

David

 

[jghrist]

From your .jpg file, it looks like you left out a minus sign before the (5 and that you left out all of your multiplication operators (*).

You also need to type an equal sign (=) after the x to evaluate it as opposed to the colon ) used to define x.

 

[grohnheit]

could you please write all what I have to write ?

 

[wfn217]

http://img385.imageshack.us/my.php?image=mathcadsa9.png

 

[IRstuff]

btw, student posting is not allowed

TTFN

Eng-Tips Policies FAQ731-376

 

[grohnheit]

thx for the help, it works now...