Question

escrever os quatro primeiros termos da seguencia definida por an=3+2n+n2,nen*

Answer 1

$an=3+2n+n^2 \\\\ a(1) = 3 + 2.(1) + (1)^2 \\ a(1) = 3 + 2 + 1 \\ a(1) = 6 \\\\\\ a(2) = 3 + 2.(2) + (2)^2 \\ a(2) = 3 + 4 + 4 \\ a(2) = 11 \\\\\\ a(3) = 3 + 2.(3) + (3)^2 \\ a(3) = 3 + 6 + 9 \\ a(3) = 18 \\\\\\ a(4) = 3 + 2.(4) + (4)^2 \\ a(4) = 3 + 8 + 16 \\ a(4) = 27$