the sum of first three terms of a gp is 13/12 and their product is -1. find the common ratio
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let a, ar,ar^2,be 3,terms
= a + ar + ar^2 =13/12
(ar)^3 = -1
ar = -1
a= -1/r
-1/r -1 -r = 13/12
r^2 +r +25/12=0
find r from this
= a + ar + ar^2 =13/12
(ar)^3 = -1
ar = -1
a= -1/r
-1/r -1 -r = 13/12
r^2 +r +25/12=0
find r from this
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