Answer:
x = [tex]\sqrt{73}[/tex]
Step-by-step explanation:
Using Pythagoras' identity in the right triangle
x² + 7² = ([tex]\sqrt{122}[/tex] )²
x² + 49 = 122 ( subtract 49 from both sides )
x² = 73 ( take the square root of both sides )
x = [tex]\sqrt{73}[/tex]
