Given the recursive rule {an} = (an – 1) – 3 and a1 = 7, find a8.
Hint
Just keep swimming…wait, we mean subtracting. Just keep subtracting.
Answer
a8 = -14
Given the recursive rule: {an} = (an – 1) + 4 and a1 = 0 , find a10.
Add 'em up. Git 'er dun.
a10 = 36
Find the recursive rule for the sequence 2, 5, 11, 23, ...
Double mint fresh. Plus one.
{an} = 2(an – 1) + 1
Find the recursive rule for the sequence 3, 12, 39, 120, …
What if we tripled each term and then added something?
{an} = 3(an – 1) + 3
Find a12 for the sequence 0, 1, 1, 2, 3, 5, …
Fibonacci lives. Don't forget that 0 is the first term.
89
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