15 replies to this topic

[MithrandiR]

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?

[R00KIE]

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

[MithrandiR]

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

[CrimsonCasio]

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

[MithrandiR]

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)

the answer appears -(x+2)^1/2+(2x-7)^1/2>0

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

[fiberoptik]

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

[R00KIE]

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

[MithrandiR]

so any1 has the answer to this so called bug ?

[Overlord]

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

[Lovecasio]

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

[R00KIE]

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).

[MithrandiR]

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

[R00KIE]

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

[MithrandiR]

how did u do that ?

i entered and didnt get that

[R00KIE]

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.