The given expression is

We can look for a number in which square power is 46 or close to 46.
Notice that, 6 times 6 is 36, and 7 times 7 is 49. This means The number is between 6 and 7.

Now, we use a calculator to find the exact solution.
![z=\sqrt[]{46}\approx\pm6.78](https://img.qammunity.org/2023/formulas/mathematics/college/wsgxf85d3ji6dn52ubp4uofsb9qoh7r0re.png)
As you can see, the approximated solutions are 6.78 and -6.78.