Lemma
EasyBinomial theorem
OpenStax, Intermediate Algebra 2e §12.3 Geometric Sequences and Series · Example 5 · Algebra · Binomial theorem

Geometric Sequences and Series · Example 5

Find the sum of the first 20 terms of the geometric sequence 7, 14, 28, 56, 112, 224, …

~5 minWritten answer · compare with the solution

OpenStax, Intermediate Algebra 2e · §12.3 Geometric Sequences and Series · Example 5

Stuck? A gentle nudge

No hints for this one.

Something off?
Workspace
Your working

Check your full solution

Upload photos of your handwritten work or a PDF, and Lemma will read it and tell you whether it's right — and where it first goes wrong if not.