To simplify the expression \( 4\sqrt{3} + 2\sqrt{48} \), we first simplify \( \sqrt{48} \):
\[ \sqrt{48} = \sqrt{16 \times 3} = \sqrt{16} \cdot \sqrt{3} = 4\sqrt{3} \]
Now, substitute \( \sqrt{48} \) back into the expression:
\[ 2\sqrt{48} = 2 \cdot 4\sqrt{3} = 8\sqrt{3} \]
Now we can add the two terms:
\[ 4\sqrt{3} + 8\sqrt{3} = (4 + 8)\sqrt{3} = 12\sqrt{3} \]
The final answer in simplest radical form is:
\[ \boxed{12\sqrt{3}} \]