In order to calculate the value of x in this triangle, we can use the Pythagorean Theorem.
This theorem shows a relation between the hypotenuse (a) and legs (b and c) in any right triangle:
![a^2=b^2+c^2](https://img.qammunity.org/2023/formulas/mathematics/high-school/zzevay1w9bd6nszr9056czntai3tkd1y5g.png)
If the legs have lengths of 15 and 8, the hypotenuse x is:
![\begin{gathered} x^2=15^2+8^2 \\ x^2=225+64 \\ x^2=289 \\ x=17 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/bax56c2jm9z5w0oscyw0bcuc3l7remfvle.png)
So the value of x is 17.