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### #1 MithrandiR

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Posted 08 November 2004 - 10:50 AM

when i type (36x^4z^4)^1/2

it just appeared like wat i typed

how do i get it to be
6x^2z^2?

### #2 R00KIE

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Posted 08 November 2004 - 11:24 AM

my guess is that you can't. you can probably get 18*x^4*z^4
(simplified with MatLab)

### #3 MithrandiR

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Posted 08 November 2004 - 02:33 PM

what i typed in was (36x^4z^4)^1/2
what appeared was (36x^4z^4)^1/2

### #4 CrimsonCasio

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Posted 08 November 2004 - 04:26 PM

use simplify, expand, etc... it depends on the situation.

### #5 MithrandiR

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Posted 09 November 2004 - 12:57 PM

yea i used those commands it didnt work

and another prob now when i used solve command to solve an inequality it didnt appear to help me at all

i put in
solve((2x-7)^1/2>(x+2)^1/2,x)

did i use the wrong command ? any 1 help me out plz

### #6 fiberoptik

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Posted 09 November 2004 - 01:46 PM

Hello, in fact it is strange, if you try without the ^1/2 it works fine.
Put this on the bugs section

### #7 R00KIE

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Posted 12 November 2004 - 12:17 PM

As i told you before you can't this time i tried with maple 9.5 and i got the same result

> simplify((36*x^4*z^4)^1/2);

18*x^4*z^4

### #8 MithrandiR

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Posted 14 November 2004 - 01:14 PM

so any1 has the answer to this so called bug ?

### #9 Guest_Guest_Ivaylo_*_*

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Posted 14 November 2004 - 03:05 PM

Ich verstehe das nicht,
ich tippe: (36*x^4*z^4)^1/2
und als Ergebnis kommt: 18*x^4*z^4

das habe ich mit ClassPad ausgerechnet.

English:

I do not understand that,
I tap: (36*x^4*z^4)^1/2
and as result comes:18*x^4*z^4

### #10 Overlord

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Posted 14 November 2004 - 03:44 PM

you are doing (x^1)/2 and not x^(1/2)

you can't simplify (x^4)^(0.5) in (x^2) :

i^4 = 1
(-i)^4 = 1
1^4 = 1
(-1)^4 = 1

and 1^0.5 = 1

but :
i^2 = -1
(-i)^2 = -1
1^2 = 1
(-1)^2 = 1

### #11 Lovecasio

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Posted 15 November 2004 - 05:19 AM

Hi.
Change the ClassPad setting to Real.
Type: (36x^4z^4)^(1/2)
And the result: 6x^2z^2.

### #12 R00KIE

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Posted 17 November 2004 - 11:05 AM

I'm sory if i led you to mistake, i saw the error you and i did, Overlord is right you were doing (...^1)/2 and not (...)^(1/2), and because i did copy/paste into matlab and maple id did not see the error until i tried it in my calculator (hp49, rpn mode).

### #13 MithrandiR

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Posted 21 November 2004 - 02:31 AM

ok the probs are solved but this one:

(m^0.5-1)/(m^0.5+1)

seems still to get the same thing i input

### #14 R00KIE

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Posted 23 November 2004 - 10:40 AM

Could you tell us what you are trying to get ??
You could try (m^(1/2)-1)/(m^(1/2)+1)
maybe that is the problem, i got (m+1-2*sqrt(m))/(m-1) but i don't know if this is what you are trying to get

### #15 MithrandiR

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Posted 23 November 2004 - 11:49 AM

how did u do that ?

i entered and didnt get that

### #16 R00KIE

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Posted 23 November 2004 - 10:20 PM

Has i said above using HP49G but you should be able to do it with your calc with the correct modes set. just spend a little time reading the manual and playing around with your calc solving simple problems to get to know your calc better, but anyway other people at this forum will certainly be able to tell you how to do it.

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