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Korvikt [17]
3 years ago
14

Find the 7th term in the sequence? -1,-3,-9

Mathematics
2 answers:
Aleks [24]3 years ago
8 0

Answer:

-729

Step-by-step explanation:

Given is a geometric sequence.

Therefore,

a = - 1, r = - 3 /(-1) = 3, n = 7

a_7 =?

\because a_n = ar^{n-1}

\therefore a_7 = (-1)(3)^{7-1}

\therefore a_7 = (-1)(3)^{6}

\therefore a_7 = (-1)(729)

\therefore a_7 = -729

frez [133]3 years ago
5 0

Answer: -21, what ever number you have you subtract 3 from that number. So after -9 would be -12 and so on

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