Question

Encontre o termo geral da p.a (4,-3,...)

Answer 1

P.A.(4 - 3 ,.......
a 1 = 4
a 2 = -3
r = a 2 - a 1
r = -3 - 4
r = -7
a n = a 1 + (n - 1).r
a n = 4 + (n - 1 ) - 7
a n = 4 + (-7 n + 7)
a n = 4 + 7 - 7 n
a n = 11 - 7 n