Find the 5th term of a geometric sequence whose first term is 4 and whose common ratio is -2

Danika Mckay

Danika Mckay

Answered question

2022-10-16

Find the 5th term of a geometric sequence whose first term is 4 and whose common ratio is -2

Answer & Explanation

fitte8b

fitte8b

Beginner2022-10-17Added 12 answers

a n = a 1 · r n - 1
For n=5, we have a 5 = 4 · ( - 2 ) 4 = 64
Josiah Owens

Josiah Owens

Beginner2022-10-18Added 3 answers

Calculate the 5th term applying definition of geometric sequence
a 1 = 4
a 2 = 4 · ( - 2 ) = - 8
a 3 = ( - 8 ) · ( - 2 ) = 16
a 4 = 16 · ( - 2 ) = - 32
a 5 = ( - 32 ) · ( - 2 ) = 64

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