Question

Determine o oitavo termo da PG (1,-2,4...)

Answer 1

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Answer 2

$razao=\frac{a_{n+1}}{n}=\frac{a_2}{a_1}=\frac{-2}{1}=-2$

Utilizando agora a equação do termo geral da PG:

$a_n=a_m.q^{n-m}\\\\a_8=a_1.q^{8-1}\\\\a_8=1.(-2)^{7}\\\\a_8=(-2)^7\\\\a_8=-128$