Ononot — The recurrence an = 7a{n-1} - 14a{n-2} + 8a{n-3} has charact

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Recurrence Relationsmedium

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The recurrence $a_n = 7a_{n-1} - 14a_{n-2} + 8a_{n-3}$ has characteristic roots $r = 1$ (double) and $r = 4$ (simple). What is the general solution?