Geometric Sequence 4, -12, 36

Geometric sequence 4, -12, 36

 

Answer:

It is geometric Sequence

Step-by-step explanation:

{a}n = a_{1} {r}^{n - 1}

r=a2/a1

r=-12/4

r=-3

find a4

a4 = (4)( - 3 ^{4 - 1} ) \\ a4 = (4)( { - 3}^{3} ) \\ a4 = (4)( - 27) \\ a4 = - 108

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