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denpristay [2]
3 years ago
15

What are the explicit equation and domain for a geometric sequence with a first term of 4 and a second term of −12?

Mathematics
1 answer:
Lerok [7]3 years ago
4 0
a_1=4;\ a_2=-12\\\\r=\dfrac{a_2}{a_1}\to r=\dfrac{-12}{4}=-3

The formula of a geometric sequence:

a_n=a_1\cdot r^{n-1}

substitute

a_n=4\cdot(-3)^{n-1}

The\ domain:\ \text{all integers where}\ n\geq1

Answer: \boxed{a_n=4(-3)^{n-1};\ \text{all integers where}\ n\geq1}
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