Problem calculating an expression with roots
02-01-2015, 09:17 AM (This post was last modified: 02-01-2015 09:19 AM by parisse.)
Post: #11
 parisse Senior Member Posts: 1,093 Joined: Dec 2013
RE: Problem calculating an expression with roots
(01-31-2015 09:59 PM)retoa Wrote:  Wow, how to complicate easy things!
Actually you only have to sum/subtract the exponents...

I'm comparing HP Prime and TI nspire CAS, I have to choose one to propose for the students in the school where I work, so I try some calculation we do at school with both of them.
The TI transforms

$$\frac{\sqrt{3}*\sqrt[3]{2*x}}{\sqrt[4]{3*x}}$$

to

$$2^{1/3}*3^{1/4}*x^{1/12}$$

in no time.

I will not say that I will choose TI because of that, the prime is better then TI in many other things, but I can not understand how a CAS calculator can not simplify something so easy. If the TI does it, then it should be possible also on the Prime hardware.
Of course it's possible, but it's not a priority. It applies only to very specific expressions that you can do by hand. I did not make my CAS with the objective to solve american schoolbool exercices, because I don't know them. It does not mean I will not adapt, it depends on time constraints and priorities.

Quote:Does it mean that the Prime can not simplify any expressions with roots at the denominator or with negative fractional exponents? That would be really limiting for the use in a school...
It's exactly the reverse. The algorithm for simplifying fractional powers on the Prime can handle expressions with + (or -), it's therefore more powerful. Simplifying the example with this algorithm takes too much time on a calc, but it works on a desktop.
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 Messages In This Thread Problem calculating an expression with roots - retoa - 01-30-2015, 09:44 PM RE: Problem calculating an expression with roots - salvomic - 01-30-2015, 09:57 PM RE: Problem calculating an expression with roots - retoa - 01-30-2015, 10:02 PM RE: Problem calculating an expression with roots - Mark Hardman - 01-30-2015, 10:37 PM RE: Problem calculating an expression with roots - retoa - 01-30-2015, 10:49 PM RE: Problem calculating an expression with roots - Mark Hardman - 01-30-2015, 11:03 PM RE: Problem calculating an expression with roots - parisse - 01-31-2015, 08:16 AM RE: Problem calculating an expression with roots - rprosperi - 01-31-2015, 04:00 PM RE: Problem calculating an expression with roots - Tim Wessman - 01-31-2015, 11:08 PM RE: Problem calculating an expression with roots - parisse - 02-01-2015, 02:40 PM RE: Problem calculating an expression with roots - retoa - 01-31-2015, 09:59 PM RE: Problem calculating an expression with roots - parisse - 02-01-2015 09:17 AM RE: Problem calculating an expression with roots - retoa - 02-02-2015, 11:49 AM RE: Problem calculating an expression with roots - parisse - 02-02-2015, 12:53 PM RE: Problem calculating an expression with roots - retoa - 02-03-2015, 10:55 AM RE: Problem calculating an expression with roots - lrdheat - 02-01-2015, 11:56 PM RE: Problem calculating an expression with roots - Gilles - 02-02-2015, 03:48 PM RE: Problem calculating an expression with roots - parisse - 02-02-2015, 04:40 PM RE: Problem calculating an expression with roots - Tim Wessman - 02-02-2015, 06:08 PM RE: Problem calculating an expression with roots - parisse - 02-02-2015, 06:25 PM RE: Problem calculating an expression with roots - salvomic - 02-02-2015, 06:10 PM RE: Problem calculating an expression with roots - Snorre - 02-02-2015, 08:20 PM RE: Problem calculating an expression with roots - Han - 02-02-2015, 08:51 PM RE: Problem calculating an expression with roots - salvomic - 02-02-2015, 08:52 PM RE: Problem calculating an expression with roots - Tim Wessman - 02-02-2015, 09:35 PM RE: Problem calculating an expression with roots - Snorre - 02-02-2015, 09:35 PM RE: Problem calculating an expression with roots - parisse - 02-03-2015, 06:40 AM RE: Problem calculating an expression with roots - Snorre - 02-03-2015, 11:59 AM RE: Problem calculating an expression with roots - retoa - 02-03-2015, 01:28 PM RE: Problem calculating an expression with roots - parisse - 02-03-2015, 02:36 PM RE: Problem calculating an expression with roots - salvomic - 05-15-2015, 01:40 PM RE: Problem calculating an expression with roots - akmon - 05-15-2015, 02:43 PM RE: Problem calculating an expression with roots - salvomic - 05-15-2015, 03:08 PM RE: Problem calculating an expression with roots - akmon - 05-15-2015, 03:22 PM RE: Problem calculating an expression with roots - salvomic - 05-15-2015, 03:35 PM RE: Problem calculating an expression with roots - akmon - 05-15-2015, 03:52 PM RE: Problem calculating an expression with roots - salvomic - 05-15-2015, 03:53 PM

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