Question

Se f(3)=2 e f(x+3)=f(x)*f(3), calcule f(-3).

Answer 1

$f(3)=2\\ \\ f(x+3)=2f(x)\\ \\ f(x)=\frac{f(x+3)}{2}\\ \\ f(0)=\frac{f(3)}{2}=1\\ \\ f(-3)=\frac{f(-3+3)}{2}=\frac{f(0)}{2}=\frac{1}{2}$