x is the hypotenuse of the right triangle. To find it, use the formula for hypotenuse:

Where:
h = hypotenuse.
a and b = sides.
In this exercise,
h = x.
a = 8.
b = 3.
So, substituting the values:

And solving the operations:

And taking the root from both sides.
![\begin{gathered} \sqrt[]{x^2}=\sqrt[]{233} \\ x=15.3 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/tz3n7lywvyxt6whrsh6wi75b89kc479a1p.png)