Geometric 5895

A2 + a3 = -6
a1 + a2 + a3 + a4 = 20
Geometric sequence
q, a1?

Correct answer:

a11 =  -1
a12 =  27
q1 =  -3
q2 =  -0.3333

Step-by-step explanation:

a1q + a1q2 = 6 a1 6 +a1 q3 = 20  a1 = 26 /(1+q3) q + q2 = 6 / 26   (1+q3) Q: 1; 3; 1/3  a11=1
a12=27
q1=3
q2=1/3=0.3333



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