Question

dada a p.a. (-19,-15,-11,...) calcule o seu enésimo termo.

Answer 1

A₁ = -19
r = 4
An = ?

An = A₁ + (n-1).r

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

Answer 2

Boa tarde!

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Dados:

a1→ -19

r → a2-a1 → -15-(-19) → -15+19 = 4

an → enésimo

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An=a1+(n-1)·r

an=-19+(n-1)·4

an=-19+4n-4

an=-23+4n → enésimo termo

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Att;Guilherme Lima