[tex]f(0) = {4}^{3 \times 0 + 3} = {4}^{0 + 3} = {4}^{3} = 64[/tex]
The answer is above.
Additional note 1:
[tex] {4}^{3} = 4 \times 4 \times 4 = 16 \times 4 = 64[/tex]
Additional note 2:
In the answer I filled in "0" at the place where "n" was. This is because the question tells us n=0