Question

Qual o sétimo termo da PG ( 1, -2,...)?

  16
  64
  -32
  32
  -64

Answer 1

q = -2
a₁ = 1
a₇ = ?

$\boxed{a_n = a_1 \cdot \ q^{n-1}} \\ \\ a_7 = 1 . (-2)^{6} \\ \\ a_7 = 1 \cdot 64 \\ \\ \boxed{a_7 = 64}$