SOLUTION: what is the 4th root of (7a)^4?

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Question 536203: what is the 4th root of (7a)^4?
Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
root%284%2C%287a%29%5E4%29 = |7a| or 7|a| but you must put absolute value bars
around it in case "a" is a negative number. Even-index roots written as
radicals never represent negative numbers.