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What's wrong with this problem? The fourth root of 81 = 3.
4 comments:
It could be 3 and -3 because 3 to the 4th and -3 to the 4th is 81
Like Riley said, 3 to the fourth is 81, and so is -3 to the fourth. However the book states: "When you find the nth root(4) of an even power(4)and an odd power is the result,(1) you must take the absolute value of the result to ensure that the value is non negative" Also one key element is missing from Riley's logic. When no plus or minus signs are given in the original problem, they want the principal root. Because the principal root is the non negative number when there are more than one real root, absolute value signs are needed
sean I beat you by 4 minutes lol
Since I did not use the radical for this question riley is correct. It could be -3.
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