Question

Could someone please help me find the missing X? Thank you :))) only if you know.

Answer 1

x = 18
`√(2)`

Explanation:

Using Pythagoras' identity in the right triangle.

The square on the hypotenuse is equal to the sum of the squares on the other 2 sides, that is

x² + 9² = 27²

x² + 81 = 729 ( subtract 81 from both sides )

x² = 648 ( take the square root of both sides )

x =
`√(648)` = 18
`√(2)` ← exact value

x ≈ 25.5 ( to 1 dec. place )