Find an explicit rule for the nth term of the sequence. -3, -15, -75, -375, ... an = 5 • -3n + 1 an = -3 • 5n - 1 an = 5 • -3n an = -3 • 5n

asked Mar 12, 2017 155k views

5 votes

Find an explicit rule for the nth term of the sequence. -3, -15, -75, -375, ...

an = 5 • -3n + 1
an = -3 • 5n - 1
an = 5 • -3n
an = -3 • 5n

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4 votes

The answer is B, I have just confirmed it.

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4 votes

It's a geometric progression where

$a=-3\\ r=5$

$a_n=ar^(n-1)\\ a_n=-3\cdot5^(n-1)$

Shreyj answered Mar 18, 2017

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