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\left(2\times 5\sqrt{2}-\sqrt{18}\right)\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}.
\left(10\sqrt{2}-\sqrt{18}\right)\sqrt{2}
Multiply 2 and 5 to get 10.
\left(10\sqrt{2}-3\sqrt{2}\right)\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}.
7\sqrt{2}\sqrt{2}
Combine 10\sqrt{2} and -3\sqrt{2} to get 7\sqrt{2}.
7\times 2
Multiply \sqrt{2} and \sqrt{2} to get 2.
14
Multiply 7 and 2 to get 14.