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I am Lyosha [343]

3 years ago

10

What is the equation for a geometric sequence with a first term of 3 and a second term of −9? an = 3(−12)n − 1 an = 3(12)n − 1 a

n = 3(−3)n − 1 an = 3(3)n − 1?

1 answer:

Nesterboy [21]3 years ago

5 0

An=a1r^n-1
a2=a1r
-9=3r
so r = -3

then an=3(-3)^n-1

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