Question

Determine os quatro primeiros termos das sequencias dadas por an=n(3+n)

Answer 1

com 1 —
an = n (3+n)
an = 1 (3 + 1)
an = 1 • 4
an = 4

com 2 —
an = n (3+n)
an = 2 (3 + 2)
an = 2 • 5
an = 10

com 3 —
an = n (3+n)
an = 3 (3 + 3)
an = 3 • 6
an = 18

com 4 —
an = n (3+n)
an = 4 (3 + 4)
an = 4 • 7
an = 28