[tex]\begin{gathered} f(x)=\frac{1}{2}\cdot4^x \\ D\colon\mleft\lbrace0,1,2\mright\rbrace \\ ------ \\ x=0 \\ f(0)=\frac{1}{2}\cdot4^0=\frac{1}{2}=0.5 \\ ------ \\ x=1 \\ f(1)=\frac{1}{2}\cdot4^1=2 \\ ----- \\ x=2 \\ f(2)=\frac{1}{2}\cdot4^2=8 \end{gathered}[/tex]
