Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 6 Rational Exponents and Radical Functions - Evaluate nth Roots and Use Rational Exponents - 6.1 Exercises - Skill Practice - Page 417: 17



Work Step by Step

So we are taking $n$ as the index, while we take $a$ as the number to be under the radical. Then, we simply check parity and solve, If the index is even, then we consider both the positive and negative root, but do not find a real root if a is negative. If the index is odd, then we consider 1 root, which must be of the same sign of $a$. $\sqrt[4] {0}= 0$ 0 is 0, whether positive or negative.
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