# fractional indices

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Thread starter 18 years ago
#1
could u show me how to do: 1/4^1/2 and (0.064)^1/3
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Thread starter 18 years ago
#2
i no the answer but i duno how to go about such a procedure
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18 years ago
#3
(Original post by fubu_05)
could u show me how to do: 1/4^1/2 and (0.064)^1/3
Something to the power of 1/n is the nth root of the something. 1/4^1/2 is the square root of 1/4
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Thread starter 18 years ago
#4
(Original post by ZJuwelH)
Something to the power of 1/n is the nth root of the something. 1/4^1/2 is the square root of 1/4

yeh i no tha but isnt there a non calc method
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Thread starter 18 years ago
#5
i can do it on calc
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18 years ago
#6
(Original post by fubu_05)
yeh i no tha but isnt there a non calc method
Just knowledge. For example 3rt 0.064 would be 0.4^3, it's just knowing.
You can of course compare 0.4^3 with 4^3, in the latter you get the result of 64 which is sort of similar to what you were asked.
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18 years ago
#7
(Original post by ZJuwelH)
Something to the power of 1/n is the nth root of the something. 1/4^1/2 is the square root of 1/4
yup 1/n is the nth root so 1/4 ^ 1/2 is sqrt of 1/4 which is obviously 1/2
(1/2 *1/2 = 1/4)

as for 0.064^1/3 convert decimal to fraction 64/1000 and cube root
0.064^1/3 = 4/10
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18 years ago
#8
(Original post by fubu_05)
could u show me how to do: 1/4^1/2 and (0.064)^1/3
1/4^1/2 = 1/2
(0.064)^1/3=2.5
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18 years ago
#9
(Original post by fubu_05)
could u show me how to do: 1/4^1/2 and (0.064)^1/3
anything raised to a half is one over the square root of X. e.g

X^1/2 = 1/(square root X)

Anything raised to a third is one over cube root of X. e.g.

X^1/3 = 1/(cube root of X)
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18 years ago
#10
(Original post by Bhaal85)
1/4^1/2 = 1/2
(0.064)^1/3=2.5
2.5? What the hell did I say???
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18 years ago
#11
(Original post by Bhaal85)
anything raised to a half is one over the square root of X. e.g

X^1/2 = 1/(square root X)

Anything raised to a third is one over cube root of X. e.g.

X^1/3 = 1/(cube root of X)
Wrong Bhaal, you only do 1/ if the power is negative...
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18 years ago
#12
(Original post by ZJuwelH)
2.5? What the hell did I say???
lol. Just playing with you.
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18 years ago
#13
(Original post by ZJuwelH)
Wrong Bhaal, you only do 1/ if the power is negative...
oh yeah, s***. Reciprocals and all, oh well.
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