# CAS SOLVE uses numeric strategy

th_roch shared this idea 7 years ago

Dear developers,

using :

SOLVE[x⁵ + x = 2.34]

on Geogebra 5.0.119.0-3D results to

{x = 1.051932190632}.

But this is a numeric solution, not an algebraic!

This is NOT according to the documentation - and might confuse students at school..

I would prefer:

- Either: No result, or

- not an = sign, instead an 'appoximate' sign.

What do you think?

Thank you

Thomas 1

Hi,

You posted an inexact (approximate) expression 2.34.

So the answer you get is the appropriate one.

If you want exact solution try the same problem with 234/100. 1

In that case there is NO easy solution. You either obtain the one you already received OR

as is the case in many CAS's

a more confusing one as RootOf[x^5 + x - 2.34, X], where X is a number assigned by the system.

Pick and choose. 1

A third solution would be writing

{x≈1.051932190632}

{x=1.051932190632}

if a numeric solution is presented.

What do you think?

Thx

Thomas 1

I see what you mean. I personally do not think it is necessary.

The dot after 1 tells the whole story. 1

Sorry, we won't be changing this. The current solution is a good, pragmatic compromise