Recursive
Formulas
Example 1
Find the recursive formula for the sequence: 4, 12, 20, 28, 36...
Step 1. Define the first term.
Step 2. Find the pattern to get from one term to the next.
4 + 8 = 12
12 + 8 = 20
20 + 8 = 28
28 + 8 = 36
Step 3. Write a recursive function to represent this pattern.
Step 4. Put the two parts together into one recursive formula.
The recursive formula is: 