5. By considering Z[¹+√5]*, or otherwise, show that if n and m are expressible as 2 a² + ab-b² and c² + cd-d², respectively, then nm is expressible as e²+ ef -f² for some integerse and f.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter1: Fundamental Concepts Of Algebra
Section1.1: Real Numbers
Problem 35E
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5. By considering Z[¹+√5]*, or otherwise, show that if n and m are expressible as
2
a² + ab-b² and c² + cd-d², respectively, then nm is expressible as e²+ ef -f² for
some integerse and f.
Transcribed Image Text:5. By considering Z[¹+√5]*, or otherwise, show that if n and m are expressible as 2 a² + ab-b² and c² + cd-d², respectively, then nm is expressible as e²+ ef -f² for some integerse and f.
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