Problem 3: Define the integer sequences (n)-1 and (yn) by Xn+Yn √2 = (3+2√2)" (So x₁ = 3 and y₁ = 2. And since (3+2√2)² = 17 + 12√2, we get x₂ = 17 and y2 = 12. Etc.) Show that x² - 2y² = 1 for all n € N.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Problem 3: Define the integer sequences (n)-1 and (yn) by
Xn+Yn √2 = (3+2√2)"
(So x₁ = 3 and y₁ = 2. And since (3+2√2)² = 17 + 12√2, we get
x₂ = 17 and y2 = 12. Etc.) Show that
x² - 2y² = 1
for all n € N.
Transcribed Image Text:Problem 3: Define the integer sequences (n)-1 and (yn) by Xn+Yn √2 = (3+2√2)" (So x₁ = 3 and y₁ = 2. And since (3+2√2)² = 17 + 12√2, we get x₂ = 17 and y2 = 12. Etc.) Show that x² - 2y² = 1 for all n € N.
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