Asked by Ify
If the sum of the first two terms of a G.P is 3 and the sum of the second and third term is -6, find the sum of the first term and common ratio.
Answers
Answered by
Reiny
a + ar = 3 -----> a(1+r) = 3
ar + ar^2 = -6 ---> ar(1+r) = -6
divide the 2nd equation by the first
r = -2
now sub that into the first to get a
and you are all set
ar + ar^2 = -6 ---> ar(1+r) = -6
divide the 2nd equation by the first
r = -2
now sub that into the first to get a
and you are all set
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