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.
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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff76dba93-23d2-47f1-b92c-ad2c0bf14e16%2F89afa37f-a9b3-48fc-9b18-ccf36ab8697b%2F1vptz2o_processed.png&w=3840&q=75)
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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