Ononot — Solve an = 2a{n-1} + a{n-2} with a0 = 1 and a1 = 3. Find a2.

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Recurrence Relationsmedium

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Solve $a_n = 2a_{n-1} + a_{n-2}$ with $a_0 = 1$ and $a_1 = 3$ . Find $a_2$ .