5. Use proof by cases to prove the statement: If a and b have the same sign, then |a+b| = |a| + |b|.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter2: The Integers
Section2.4: Prime Factors And Greatest Common Divisor
Problem 7E: If a0 and ab, then prove or disprove that (a,b)=a.
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5. Use proof by cases to prove the statement:
If a and b have the same sign, then |a+b| = |a| + |bl.
Transcribed Image Text:5. Use proof by cases to prove the statement: If a and b have the same sign, then |a+b| = |a| + |bl.
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