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# equation

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## equation

(OP)
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.

### RE: equation

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

### RE: equation

(OP)
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 ?

### RE: equation

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

### RE: equation

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

### RE: equation

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

### RE: equation

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.

### RE: equation

(OP)
could you please write all what I have to write ?

### RE: equation

btw, student posting is not allowed

TTFN

Eng-Tips Policies FAQ731-376

### RE: equation

(OP)
thx for the help, it works now...

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