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dxfan101010
Member
Joined: 31 Mar 2008
Posts: 194
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 Posted: 09 Oct 2009 05:41:20 pm Post subject: |
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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
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| Posted: 09 Oct 2009 08:38:45 pm Post subject: |
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| 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
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| Posted: 09 Oct 2009 08:46:45 pm Post subject: |
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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
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| Posted: 10 Oct 2009 12:07:59 pm Post subject: |
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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
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| Posted: 10 Oct 2009 12:34:49 pm Post subject: |
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Hint: (x^(a/ )^(b/a)=x |
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tiuser1010
Member
Joined: 23 Apr 2009
Posts: 100
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| Posted: 10 Oct 2009 07:52:59 pm Post subject: |
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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 ³√ (X²). Now we look at negitives. if there is one and only one negitive in the fraction then we put ³√ (X²) 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/(³√ (X²))
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
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| Posted: 10 Oct 2009 09:42:33 pm Post subject: |
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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
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| Posted: 09 Aug 2011 11:12:32 pm Post subject: |
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| I can not download files?why? |
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