If \(x=u^2-v^2, y=2uv\) and \(z=u^2+v^2,\) and if \(x=11,\) what is the value of \(z?\)

[Gmat_mission]

If \(x=u^2-v^2, y=2uv\) and \(z=u^2+v^2,\) and if \(x=11,\) what is the value of \(z?\)

(1) \(y = 60\)
(2) \(u = 6\)

[spoiler]OA=D[/spoiler]

Source: GMAT Prep