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.
As you can see, the approximated solutions are 6.78 and -6.78.