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2\sqrt{5}+4\sqrt{5}
Factor 80=4^{2}\times 5. Rewrite the square root of the product \sqrt{4^{2}\times 5} as the product of square roots \sqrt{4^{2}}\sqrt{5}. Take the square root of 4^{2}.
6\sqrt{5}
Combine 2\sqrt{5} and 4\sqrt{5} to get 6\sqrt{5}.