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Find the third term in a geometric sequence if a = 8 and r = -1. Use the formula a(subscript n) = arⁿ⁻¹

Find the third term in a geometric sequence if a = 8 and r = -1. Use the formula a(subscript n) = arⁿ⁻¹
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4 votes
Find the third term in a geometric sequence if a = 8 and r = -1. Use the formula a(subscript n) = arⁿ⁻¹

User Lostfields
by
8.2k points

1 Answer

5 votes

Answer:


a_(3) = 8

Explanation:

=>
a_(n) = ar^{n-1

Where n = 3, a = 8 and r = -1

=>
a_(3) = (8)(-1)^(3-1)

=>
a_(3) = (8)(1)

=>
a_(3) = 8

User Nicolas Reynis
by
7.5k points
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