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Clare Forbes
Mathematics
15 May, 09:45
What is 81 to the power of - 1/4?
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Adrian Webb
15 May, 09:58
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81^ (-1/4) is the same as the fourth root of (1/81). Which can be written as 4th root of 1 divided by the 4th root of 81.
The 4th root of 1 is 1 (because 1x1x1x1x1=1).
The 4th root of 81 is 3 (because 3x3x3x3=81).
So 81^ (-1/4) = 1/3
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