Asked by praise
if(3-x)+(6)+(7-5x)is a geometric se ries, find two posible value for x,the common ratio and the sum of th g.p
Answers
Answered by
Reiny
r = 6/(3-x) OR r = (7-5x)/6
6/(3-x) = (7-5x)/6
21 - 15x - 7x + 5x^2 = 36
5x^2 - 22x - 15 = 0
(x - 5)(5x + 3) = 0
x = 5 or x = -3/5
so the common ratio could be
6/3-5) = -2
or
6/(-3/5) = -10
if r = -2, we have
-3 + 6 - 12 = -9
if r = -10 , we have
-5/3 + 6 - 60 = - 167/3
check my arithmetic
6/(3-x) = (7-5x)/6
21 - 15x - 7x + 5x^2 = 36
5x^2 - 22x - 15 = 0
(x - 5)(5x + 3) = 0
x = 5 or x = -3/5
so the common ratio could be
6/3-5) = -2
or
6/(-3/5) = -10
if r = -2, we have
-3 + 6 - 12 = -9
if r = -10 , we have
-5/3 + 6 - 60 = - 167/3
check my arithmetic
Answered by
Marian
What is the common ratio
Answered by
Sunshine
The common ratio is -3
Answered by
Isaac
Ratio is -3
Answered by
Andrew
-3,1/2/3
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