IXL Algebra1 - P.10 Convert a Recursive Formula to an Explicit Formula

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Given a recursive formula for an arithmetic or geometric sequence, students find the explicit formula.

I explain the conversion by using the analogous situation with a function y = mx + b and use the common difference as the slope and find the zero term as the b.
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struggled for two hours on this, watched like 12 minutes and instantly got 100 on it, huge props!

gothcoth