Three members GP

The sum of three numbers in GP (geometric progression) is 21 and the sum of their squares is 189. Find the numbers.


a =  3
b =  6
c =  12
a2 =  12
b2 =  6
c2 =  3


Solution in text a =
Solution in text a = : Nr. 1
Solution in text a = : Nr. 1
Solution in text a = : Nr. 1

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Solution in text b =
Solution in text c =
Solution in text a2 =
Solution in text b2 =
Solution in text c2 =

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