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.

Correct answer:

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

Step-by-step explanation:

Our quadratic equation calculator calculates it.

b=q1 a=2 3=6
c=q1 b=2 6=12
b2=q2 a2=0.5 12=6
c2=q2 b2=0.5 6=3

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