Question

encontre o termo geral da P.A (2,7...)

Answer 1

a1 = 2
r = 5

an = a1 + (n - 1).r
an = 2 + (n - 1).5
an = 2 + 5n - 5
an = 5n - 3

Answer 2

a1 = 2 an = a1 + (n - 1) . r an = 2 + ( n - 1) . 5 an = 2 + 5n - 5 an = 5n - 3 , com n EN* a2 = 7 r = 7 - 2 r = 5