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how do you raise 81 to the power of -0.25?
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Breanna018

by Breanna018 at September 12, 2010

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Think of it as [(81)^.25]^-1.After that, it is relatively simple. 3^4 is 81 so its 3^-1 which is equal to 1/3.
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Kyu001 Kyu001 September 12, 2010

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since the exponent is negative, you make it a fraction by placing a one on top. the you change the decimal into a fraction(1/4), now just solve 81^1/4 by taking the 4th root of 81
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Car...los... Car...los... September 12, 2010

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Actually, the previous answer was correct.... you take 81 to the fourth root, then you need to take the reciprocal of that root... which is 1/3
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John_Doe John_Doe September 13, 2010

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