Question

Escreva uma PG de 4 termos a1=-1000 e q=1/2

Answer 1

P.G(-1000 ; -500 ; -250 ; 125)

a 1 = -1000
q = 1/2
a 2 = a 1 . q^n - 1
a 2 = -1000 . (1/2)^2-1
a 2 = -1000 . (1/2)¹
a 2 = -1000 . 1/2
a 2 = -500
a 3 = a 1 . (1/2)^n-1
a 3 = -1000 . (1/2)^3-1
a 3 = -1000 . (1/2)²
a 3 = -1000 . 1/4
a 3 = -250
a 4 = a 1 . (1/2)^n - 1
a 4 = -1000 . (1/2)4-1
a 4 = -1000 . (1/2)³
a 4 = -1000 . 1/8
a 4 = -125