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balandron [24]
3 years ago
12

For the geometric sequence -1,-2,-4... find a8

Mathematics
2 answers:
Alinara [238K]3 years ago
4 0
An=a1(r)^(n-1)
a1=first term
r=common ratio

so
firs term is -1

each is double the prevoius
r=2

an=-1(2)^n-1
8th term
a8=-1(2)^(8-1)
a8=-1(2)^7
a8=-1(128)
a8=-128
the 8th term is -128

swat323 years ago
4 0
Geometric sequence formula gn = g1 (r)^n - 1

To find the ratio you divide g2 by g1

G1 = first number in the series



To find g8 you just plug 8 instead of n

g8 = g1 (r)^8 - 1

g8 = -1 (2)^8 - 1

g8 = -128
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