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2\times 3\sqrt{2}+5\sqrt{50}-4\sqrt{2}
Factor 18=3^{2}\times 2. Rewrite the square root of the product \sqrt{3^{2}\times 2} as the product of square roots \sqrt{3^{2}}\sqrt{2}. Take the square root of 3^{2}.
6\sqrt{2}+5\sqrt{50}-4\sqrt{2}
Multiply 2 and 3 to get 6.
6\sqrt{2}+5\times 5\sqrt{2}-4\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}.
6\sqrt{2}+25\sqrt{2}-4\sqrt{2}
Multiply 5 and 5 to get 25.
31\sqrt{2}-4\sqrt{2}
Combine 6\sqrt{2} and 25\sqrt{2} to get 31\sqrt{2}.
27\sqrt{2}
Combine 31\sqrt{2} and -4\sqrt{2} to get 27\sqrt{2}.