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Patrick
Mathematics
19 February, 13:16
For the geometric sequence
-1,-2,-4 ... find a8
+5
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2
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Braedon Salas
19 February, 13:26
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
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Destiney Hood
19 February, 13:39
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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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