Answer:

Explanation:
Sorry for the drawing but I hope you'll understand what I mean when I say y now.
Using Pythagoras Theorem,
y² = (5root5)² - 5² = 125 - 25 = 100
y = root 100 = 10
Using PT,
x² = 22² + y² = 22² + 10² = 484+100 = 584
x = root 584 = 2 root 146