Question: Suppose a recurrence relation   an=an−1+2an−2 where a1=11 and a2=31   can be represented in explicit formula, either as: Formula 1: an=pxn+qnxn                                            or    Formula 2: an=pxn+qyn   where  x and y are roots of the characteristic equation.   **If the explicit formula is in the form of Formula 2, consider p > q.   Determine p and q

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Question:

Suppose a recurrence relation

 

an=an−1+2an−2

where a1=11 and a2=31

 

can be represented in explicit formula, either as:

Formula 1:
an=pxn+qnxn

                                           or   

Formula 2:
an=pxn+qyn

 

where 

x

and

y

are roots of the characteristic equation.

 

**If the explicit formula is in the form of Formula 2, consider p > q.

 

Determine

p

and

q

 

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