Answer:
[tex]x=\sqrt{55}[/tex] (B.)
Step-by-step explanation:
Equation:
[tex]a^{2} +b^{2} = c^{2}[/tex]
[tex](3^{2} )+(x^{2})=(8^{2})[/tex]
[tex]9+x^{2} =64[/tex]
[tex]x^{2} = 55[/tex]
[tex]\sqrt{x^{2} } =\sqrt{55}[/tex]
[tex]x=\sqrt{55}[/tex]
