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dxfan101010


Member


Joined: 31 Mar 2008
Posts: 194

Posted: 09 Oct 2009 05:41:20 pm    Post subject:

Ok so on my math hw this week we had a problem

41x^(-2/3)=1000
and i got it to
x^(-2/3)=24.3902
and then pluged it inot the slover on the ti 83 but is there any way to take x^(-2/3)=24.3902 and simplfy it more

same with
1/(X^2)=8.6956

and

4.72/x^(3/2)-135=o

thanks


Last edited by Guest on 09 Oct 2009 05:52:57 pm; edited 1 time in total
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Graphmastur


Advanced Member


Joined: 25 Mar 2009
Posts: 360

Posted: 09 Oct 2009 08:38:45 pm    Post subject:

I'll give you a hint. X^(1/3) = cube root of X.
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dxfan101010


Member


Joined: 31 Mar 2008
Posts: 194

Posted: 09 Oct 2009 08:46:45 pm    Post subject:

i got that and i was able to get through the first few problems compleatly But it is the negatives and the improper fractions that are messing me up
so i guess my question is does x^(-2/3) = negative cube root of x times negative cube root of x (-3√x)*(-3√x) which would actually be (3√x)^-2

and i am totally lost on simplfying the division


Last edited by Guest on 09 Oct 2009 09:40:36 pm; edited 1 time in total
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simplethinker
snjwffl


Active Member


Joined: 25 Jul 2006
Posts: 700

Posted: 10 Oct 2009 12:07:59 pm    Post subject:

Hint: a-b = 1/ab. For example, 4-2 = 1/42 = 1/16 = 0.0625

Last edited by Guest on 10 Oct 2009 12:08:19 pm; edited 1 time in total
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calc84maniac


Elite


Joined: 22 Jan 2007
Posts: 770

Posted: 10 Oct 2009 12:34:49 pm    Post subject:

Hint: (x^(a/Cool)^(b/a)=x
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tiuser1010


Member


Joined: 23 Apr 2009
Posts: 100

Posted: 10 Oct 2009 07:52:59 pm    Post subject:

well this is how i handle negitive fractional powers. The first thing i do is look at the numerator and put the base to that power and ignore negitive AT FIRST. So in your case i would square X. Then i look at the bottom part of the fraction and and then put the new modified base to that root so now we have √ (X). Now we look at negitives. if there is one and only one negitive in the fraction then we put √ (X) to the negitive 1. If both are negitive or neither is negitive then we leave the answer as is. In your case we will put it to the -1 power or put 1 over the answer.

So now we have X^(-2/3)=1/(√ (X))


Last edited by Guest on 10 Oct 2009 07:55:51 pm; edited 1 time in total
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dxfan101010


Member


Joined: 31 Mar 2008
Posts: 194

Posted: 10 Oct 2009 09:42:33 pm    Post subject:

Thank you all if gotten all my equations simplfyed to being able to solve them . Thanks tiuser1010 iwas having trouble with the negatives what's ur sig say



中文很好
赵挥
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newtonoracle


Newbie


Joined: 09 Aug 2011
Posts: 1

Posted: 09 Aug 2011 11:12:32 pm    Post subject:

I can not download files?why?
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