Answer: 3∛2
Step-by-step explanation:
First, factor 128 .... you need three common factors to bring one on the outside of the radical.
[tex]\dfrac{3}{4}\sqrt[3]{128} \\\\\\=\dfrac{3}{4}\sqrt[3]{4\cdot 4\cdot 4\cdot 2} \\\\\\=\dfrac{3}{4}\cdot 4\sqrt[3]{2} \\\\\\=\large\boxed{3\sqrt[3]{2} }[/tex]
