Write the number as [ [27^(1/3)] ^4 ] ^-1
Since exponents multiply, this is equivalent to 27^(-4/3)
Take the cube root of 27 ---> 3
Raise it to the 4th power ----> 81 = (3)(3)(3)(3)
Invert it due to the negative exponent (-4/3)
27^(-43) = 1/81
2007-02-06 05:26:53
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answer #1
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answered by MamaMia © 7
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cube root of 27 first
3^ -4
the negative exponent means reciprocal so that is
1/ 3^4 which is 1/81
another method would be to write the prime factorization of 27 as exponents
3^3
then the problem looks like (3^3)^ (-4/3)
when raising a power to a power multiply exponents
3 ^ (3 x -4/3) which gives 3 ^ -4
negative exponents means recriprocal so that would be 1/3^4
which is 1/81
maybe a different way to look at it
2007-02-06 05:29:34
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answer #2
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answered by Ray 5
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this equates to the cube root of 1/27^4
or 3^-4 which is 1/3^4
1/81
Hope this helps! :)
2007-02-06 05:28:59
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answer #3
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answered by disposable_hero_too 6
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27 is 3 cubed, therefore 27^-4/3 becomes 3^3(-4/3) which is the same as 3^-4=1/81......HOPE THAT HELPS!!!
2007-02-06 05:27:40
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answer #4
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answered by RobLough 3
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27 = 3^3
so (3^3)^ -4/3 = 3 ^ ( -4*3/3) = 3^-4 = 1/81
2007-02-06 05:29:49
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answer #5
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answered by Sobir 1
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