Please i need help this is 50% of my grade!!

[tex]\bf\green{AC² = AB² + BC²}[/tex]
[tex]\bf \: (8)² = (x)² + (6)²[/tex]
[tex]\bf \: 64 = x² + 36[/tex]
[tex]\bf \: 64 - 36 = x²[/tex]
[tex]\bf \: 28 = x²[/tex]
[tex]\bf \: √28 = x[/tex]
[tex]{\underline{\boxed{\bf{∴ 14 = x}}}} [/tex]