Question

How does this work?????

Answer 1

x = 4
`√(5)`

Explanation:

Since the triangle is right, solve for x using Pythagoras' identity, that is

x² = 8² + 4² = 64 + 16 = 80

Take the square root of both sides

x =
`√(80)` =
`√(16(5))` =
`√(16)` ×
`√(5)` = 4
`√(5)` ← exact value