Question

dada a P.A (-19,-15,-11,...) Qual o termo geral?

Answer 1

A1 = - 19

R = - 15 -(-19) =  - 15+19 = 4



An = a1 + (n-1).r

An = - 19 (n-1)(4)

An = - 19 + 4n - 4

An = - 23 + 4n