\((\sqrt{9+\sqrt{80}}+\sqrt{9-\sqrt{80}})^2=\)

[Gmat_mission]

\((\sqrt{9+\sqrt{80}}+\sqrt{9-\sqrt{80}})^2=\)

A. \(1\)

B. \(9-4\sqrt5\)

C. \(18-4\sqrt5\)

D. \(18\)

E. \(20\)

Answer: E

Source: GMAT Prep