Find the Initial Value and the Final Value of F(t) $$F ( s ) = \frac { s + 15 } { s ^ { 2 } \left( s ^ { 2 } + 4 s + 12 \right) }$$

Find the initial value and the final value of f(t) if $$F ( s ) = \frac { s + 15 } { s ^ { 2 } \left( s ^ { 2 } + 4 s + 12 \right) }$$