Mathematics
baemax
2016-04-11 09:48:12
Identify the 8th term of the geometric sequence -2, -12, -72 ...
ANSWERS
owl101
2016-04-11 14:31:56

Multiplies by 6 each time. -2 (1) -2 times 6 = -12 (2) 12 times 6 = -72 (3) -72 times 6 = -432 (4) -432 times 6 = -2592 (5) -2592 times 6 = -15552 (6) -15552 times 6 = -93312 (7) -99312 times 6 = -559872 (8) Therefore it is, -559872

A230385
2016-04-11 14:33:11

Any geometric sequence can be expressed as: a(n)=ar^(n-1), a=initial term, r=common ratio, n=term number r=-12/-2=-72/-12=6  and a=-2 so a(n)=-2(6)^(n-1) so a(8)=-2(6^7) a(8)= -559872

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