Respuesta :

[tex]\bf \begin{array}{ccll} x&f(x)\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 2&\stackrel{3^2+1}{10}\\ 3&\stackrel{3^3+1}{28}\\ 4&\stackrel{3^4+1}{82} \end{array}\implies f(x)=3^x+1[/tex]