Square roots and exponents
We know that
[tex]\begin{gathered} 36=6^2 \\ \text{and} \\ \sqrt[]{36x^3}=\sqrt[]{36}\cdot\sqrt[]{x^3} \end{gathered}[/tex]
Square roots can be expressed as a fraction on the exponent:
[tex]\begin{gathered} \sqrt[]{36x^3}=(36x^3)^{\frac{1}{2}} \\ \sqrt[]{36}\cdot\sqrt[]{x^3}=\sqrt[]{6^2}\cdot\sqrt[]{x^3} \\ =6^{\frac{2}{2}}\cdot x^{\frac{3}{2}} \\ =6x^{\frac{3}{2}} \end{gathered}[/tex]
Answer: C
