GMAT For Dummies 2020 by Lisa Zimmer Hatch & Scott A. Hatch

Author:Lisa Zimmer Hatch & Scott A. Hatch
Language: eng
Format: epub
ISBN: 9781119617976
Publisher: Wiley
Published: 2019-12-18T00:00:00+00:00

What all of this means is that any number taken to an even power either remains or becomes positive, and any number taken to an odd power keeps the sign it began with. Another interesting tidbit to digest is that any term with an odd power that results in a negative number will have a negative root, and this is the only possible root for the expression. For example, if , then . That is, the cube root of –125 is –5.

On the other hand, anytime you have an exponent of 2, you have two potential roots, one positive and one negative, for the expression. For example, if , then or –8. So 64 has two possible square roots: either 8 or –8.

In the following sections, we outline a few rules for adding, subtracting, multiplying, and dividing exponents. We also clue you in on how to figure out the powers of 0 and 1 and what to do with fractional and negative exponents.

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