Answer:
x = 3
Step-by-step explanation:
assuming the triangle is right.
using Pythagoras' identity
(x + 2)² = x² + 4²
x² + 4x + 4 = x² + 16 ( subtract x² from both sides )
4x + 4 = 16 ( subtract 4 from both sides )
4x = 12 ( divide both sides by 4 )
x = 3
