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Mathematics 9 Online
OpenStudy (yuii):

What is the recursive rule for this geometric sequence? 7, 21, 63, 189, … http://prntscr.com/dg48wx

OpenStudy (mathmale):

Think: How would you get from 7 to 21 via multiplication? From 21 to 63 via multiplication? What is the common ratio here? Please answer; then we'll continue.

OpenStudy (yuii):

You'd have to multiply by three.

OpenStudy (mathstudent55):

Correct. That means any new term is the previous term multiplied by 3.

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