This is a right triangle, so we can use the trusty Pythagorean Theorem to solve for the missing side. Remember, the Pythagorean Theorem is a² + b² = c², where c is the hypotenuse of a right triangle.
The hypotenuse of our triangle is given, so:
a² + b² = c²
10² + b² = 15²
100 + b² = 225
b² = 125
b ≈ 11.2
Answer:
x is approximately 11.2 units.