Answer:
x = 3
Step-by-step explanation:
Applying Pythagoras' identity to the right triangle.
The square on the hypotenuse is equal to the sum of the squares on the other 2 sides, that is
x² + x² = ([tex]\sqrt{18}[/tex] )², that is
2x² = 18 ( divide both sides by 2 )
x² = 9 ( take the square root of both sides )
x = [tex]\sqrt{9}[/tex] = 3
