The right triangle shown below is formed by joining three squares at their vertices. What is the value of x , the side length of the smallest square?

Answer:
B: 8
Step-by-step explanation:
The area of the two smaller squares equals the area of the big square so find the area to the big square
17 * 17 = 289
289 - 225 = 64
The square root of 64 is 8 so the answer is 8.