Resposta :
[tex] > resolucao \\ \\ \\ \geqslant progressao \: geometrica \\ \\ \\ an = a1 \times q {}^{n - 1} \\ \\ an = 5 \times 4 {}^{8 - 1} \\ \\ an = 5 \times 4 {}^{7} \\ \\ an = 5 \times 16384 \\ \\ an = 81920 \\ \\ \\ = = = = = = = [/tex]

[tex] > resolucao \\ \\ \\ \geqslant progressao \: geometrica \\ \\ \\ an = a1 \times q {}^{n - 1} \\ \\ an = 5 \times 4 {}^{8 - 1} \\ \\ an = 5 \times 4 {}^{7} \\ \\ an = 5 \times 16384 \\ \\ an = 81920 \\ \\ \\ = = = = = = = [/tex]