Question

determine o 8° termo da PG (3,9,27...)​

Answer 1

Resposta:

6561

Explicação passo-a-passo:

P.G. de razão q=3

$an = a1. {q}^{n - 1} \\ a8 = 3. {3}^{7} \\ a8 = {3}^{8}$

Answer 2

$\mathsf{q=\dfrac{a_{2}}{a_{1}} =\dfrac{9}{3}=3}$

$\mathsf{a_{8}=a_{3}.q^5}\\\mathsf{a_{8}=27.3^5}\\\mathsf{a_{8}=3^3.3^5}\\\mathsf{a_{8}=3^8}$