What is the 7th term of the geometric sequence 4, -20, 100

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asked Oct 15, 2018 166k views

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Jhuliano Moreno · Answer 1 · 2018-10-20T13:40:16+0000

1st let's calculate r the common ratio:
r = (-20)/4 = (100/-20) = -5

Value of nth term = a₁.rⁿ⁻¹, where a₁= 1st term and n, the rank

Value of nth term = 4r⁽⁷⁻¹⁾ = 4.(-5)⁶

Value of nth term = 62,500

What is the 7th term of the geometric sequence 4, -20, 100

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