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2 years ago

Find an explicit rule for the nth term of the sequence.

Mathematics

1 answer:

Sphinxa [80]2 years ago

7 0

Step-by-step explanation:

in a geometric sequence there is a constant factor x that is multiplied with every previous term to create the next one.

a2 = 20

a5 = 1280 = a2×x×x×x = a2×x³ = 20x³

64 = x³

x = 4

=> a1 = 5

therefore

an = an-1×4 =

$a1 \times {4}^{n - 1}$

n > 1

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