Question

Calcule a soma dos quatro primeiros termos da sequencia definida por aₐ=2ⁿ+3

Answer 1

$a_n=2^n+3\\a_1=2^1+3=2+3=5\\a_2=2^2+3=4+3=7\\a_3=2^3+3=8+3=11\\a_4=2^4+3=16+3=19\\\\5+7+11+19=\boxed{42}$