# Geometric seq

Find the third member of geometric progression if a1 + a2 = 36 and a1 + a3 = 90. Calculate its quotient.

Correct result:

c1 =  81
c2 =  373248
q1 =  3
q2 =  0

#### Solution:

Our quadratic equation calculator calculates it.

$c_{2}=a_{2} \cdot \ a_{2}^2=72 \cdot \ 72^2=373248$
$q_{1}=3$
${q}_{2}=0$

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