- #1

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I need to find the explicit formuala for this recursive sequence.

Code:

```
a[sub]1[/sub] = 3
a[sub]2[/sub] = 7
a[sub]n[/sub] = 7a[sub]n-1[/sub] - 10a[sub]n-2[/sub]
a[sub]n[/sub] - 7a[sub]n-1[/sub] + 10a[sub]n-2[/sub] = 0
t[sup]n[/sup] - 7k[sup]n-1[/sup] + 10t[sup]n-2[/sup] = 0
t[sup]2[/sup] - 7t + 10 = 0
(t - 2)(t - 5)
(t = 2)(t = 5) :confused:
if that is right I can move on.
```

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