To convert from radical form to exponential in fractional form, we can follow:
![\sqrt[m]{b^n}=b^{(n)/(m)}](https://img.qammunity.org/2023/formulas/mathematics/high-school/i2kf8mowumt2ho4np6tw3rax2mls5r0wak.png)
Firstly, notice that 9 is the same as 3 squared:
![\sqrt[4x+2]{9}=\sqrt[4x+2]{3^2}](https://img.qammunity.org/2023/formulas/mathematics/high-school/te3if9t4somyygfhq90kznvyv0hzu9ht5h.png)
Now, we can apply the change:
![\sqrt[4x+2]{3^2}=3^{(2)/(4x+2)}](https://img.qammunity.org/2023/formulas/mathematics/high-school/75flxr1v9fravtm4ul9bt8mubfc41v02l9.png)
Also, notice that we can factor out the 2 on the denominator to cancel with the two on the numerator:

So, the expression in the simples form and fractional exponent is:
