Does anyone know what this is?

Answer:
[tex] {(4x)}^{ \frac{3}{2}} [/tex]
Step-by-step explanation:
[tex] \huge \sqrt{( {4x)}^{3} } \\ \\ \huge = \: {(4x)}^{3 \times \frac{1}{2} } \\ \\ {\huge {\red{ \boxed{ = {(4x)}^{ \frac{3}{2} }}}}}..required \: answer \\ \\ \huge = ( {4})^{ \frac{3}{2} } {x}^{ \frac{3}{2} } \\ \\ \huge = ( { {2}^{2} })^{ \frac{3}{2} } {x}^{ \frac{3}{2} } \\ \\ \huge = ( { {2} })^{ 3 } {x}^{ \frac{3}{2} } \\ \\ \huge \: = 8 {x}^{ \frac{3}{2} } [/tex]