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Find an explicit rule for the nth term of the sequence. -3, -15, -75, -375, ...
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do you have the geometric series equation handy?
Not at the moment, but I'm looking for it!
an = a1r n-1
so you need to find what "r" is. it's basically just the common ration between these numbers.
How do I find the ratio?
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divide the two terms of series to find ratio
the ratio is a_2 / a_1
Okay so 5
ya, so you know the equation, just plug in a_1 and r into it and leave it as an equation for you answer
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