Question

encontre os quatros primeiros termos das sequencias dadas an=n²+4

Answer 1

$an = n^2 + 4 \\ \\ a_1 = 1^2 + 4 => a_1 = 5 \\ \\ \\ a_2 = 2^2 + 4 \\ \\ a_ 2 = 4 + 4 => a_2 = 8 \\ \\ \\ a_ 3 = 3^2 + 4 \\ \\ a_3 = 9 + 4 => a_3 = 13 \\ \\ \\ a_ 4 = 4^2 + 4 \\ \\ a_ 4 = 16 + 4 => a_ 4 = 20$