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OpenStudy (anonymous):
Find an explicit rule for the nth term of the sequence. -3, -15, -75, -375, ...
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OpenStudy (agent0smith):
http://www.regentsprep.org/Regents/math/algtrig/ATP2/ArithG11.gif Find r the exact same way as in the last question a1 is first term
OpenStudy (agent0smith):
"find the common ratio first - divide any term by the term right before it (use the first two terms since it's easiest to)"
OpenStudy (anonymous):
i got an=-3*5^n-1
OpenStudy (agent0smith):
Excellent.
OpenStudy (anonymous):
Yay thanks
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