Question 736406
(3-x)+(6)+(7-5x) is a geometric series, find two possible values for
a) x
b) the common ratio
c) the sum of the GP.

{{{(3-x)/(6)=6/(7-5x)}}}

(3-x)(7-5x)=6^2

21-15x-7x+5x^2=36

5x^2-22x-15=0

5x^2-25x+3x-15=0

5x(x-5)+3(x-5)=0

(x-5)(5x+3)=0
x=5 OR -3/5

if x=5

-2,6,-28

common ratio = -4

you should be able to continue