Question

Encontrar o termo geral da P.A.(-2,4,...)

Answer 1

r = 4 -(-2)
r = 6

an = -2 + (n -1) . 6
an = -2 +6n -6
an = 6n -8

Answer 2

an = a1 + (n-1) . r

an = -2 + (n-1) . 6

an = -2 + 6n - 6

an = -8 + 6n