Find the length of the leg `x` on the right triangle below. Enter the exact value, not a decimal approximation.

[Graphs generated by this script: initPicture(-3,8+3,-3,8+3);path([[0,0],[8,0],[0,7.5498344352707],[0,0]]);text([8/2,7.5498344352707/2],'11','right');text([0,7.5498344352707/2],'x','left');text([8/2,0],'8','below');]

`x =`