Question

Função exponencial...................

Answer 1

$Resolu\c{c}\~ao \to \left\{\begin{array}{ccc}f(x)=c*(1+i)^x\\f(x-1) = c*(1+i)^{x-1}\\\\c*(1+i)^x-c*(1+i)^{x-1}\\\\c*(1+i)^x- \frac{c*(1+i)^x}{(1+i)}\\\\ \frac{c*(1+i)^x*(1+i)-c*(1+i)^x}{(1+i)}\\\\ \frac{c*(1+i)^x*[(1+i)-1]}{(1+i)} \\\\ \frac{c*(1+i)^x*i}{(1+i)} \\\\\boxed{\boxed{ci*(1+i)^{x-1}}} \to Letra\ B \end{array}\right$

Obs: * = multiplicação

Espero ter ajudado. :))