Respuesta :

Answer:

x=8

Step-by-step explanation:

55+9

64=x^2

Square root of 64 is 8

X=8

Answer:+8 or -8

Step-by-step explanation:

[tex]x^{2} -9=55\\x^{2} =55+9\\x^{2} =64\\\sqrt{x^2} =\sqrt{64} \\x=8 \\or \\x=-8[/tex]