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Neporo4naja [7]
3 years ago
14

For the following geometric sequence find the explicit formula: {-1, 3, -9,...}

Mathematics
2 answers:
brilliants [131]3 years ago
7 0

Answer:

a_{n} = - 1 (-3)^{n-1}

Step-by-step explanation:

The explicit formula for a geometric sequence is

a_{n} = a (r)^{n-1}

where a is the first term and r the common ratio

Here a = - 1 and r = 3 ÷ - 1 = - 3 , thus explicit formula is

a_{n} = - 1 (-3)^{n-1}

Aneli [31]3 years ago
3 0
Multiplies by -3 every time
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