John knows that multiplying a number by — 1 merely changes the sign ofthe number. He reasons that multiplying a number by an even power of — 1 will change the sign of the number an even number of times. Heconcludes that this is equivalent to multiplying a number by + 1 , so that every even power of -1 is equal to a +1?

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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John knows that multiplying a number by — 1 merely changes the sign of
the number. He reasons that multiplying a number by an even power of — 1 will change the sign of the number an even number of times. He
concludes that this is equivalent to multiplying a number by + 1 , so that every even power of -1 is equal to a +1?

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