Five members

Write first 5 members geometric sequence and determine whether it is increasing or decreasing:
a1 = 3
q = -2

Result

a1 =  3
a2 =  -6
a3 =  12
a4 =  -24
a5 =  48

a5 =

Solution:

${a}_{1}=3$
${a}_{2}=3\cdot -2=-6$
${a}_{3}=3\cdot -{2}^{2}=12$
${a}_{4}=3\cdot -{2}^{3}=-24$
${a}_{5}=3\cdot -{2}^{4}=48$

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