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4\times 5\sqrt{2}-\sqrt{72}+2\sqrt{2}
Factor 50=5^{2}\times 2. Rewrite the square root of the product \sqrt{5^{2}\times 2} as the product of square roots \sqrt{5^{2}}\sqrt{2}. Take the square root of 5^{2}.
20\sqrt{2}-\sqrt{72}+2\sqrt{2}
Multiply 4 and 5 to get 20.
20\sqrt{2}-6\sqrt{2}+2\sqrt{2}
Factor 72=6^{2}\times 2. Rewrite the square root of the product \sqrt{6^{2}\times 2} as the product of square roots \sqrt{6^{2}}\sqrt{2}. Take the square root of 6^{2}.
14\sqrt{2}+2\sqrt{2}
Combine 20\sqrt{2} and -6\sqrt{2} to get 14\sqrt{2}.
16\sqrt{2}
Combine 14\sqrt{2} and 2\sqrt{2} to get 16\sqrt{2}.