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3\times 5\sqrt{2}-2\sqrt{32}
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}.
15\sqrt{2}-2\sqrt{32}
Multiply 3 and 5 to get 15.
15\sqrt{2}-2\times 4\sqrt{2}
Factor 32=4^{2}\times 2. Rewrite the square root of the product \sqrt{4^{2}\times 2} as the product of square roots \sqrt{4^{2}}\sqrt{2}. Take the square root of 4^{2}.
15\sqrt{2}-8\sqrt{2}
Multiply -2 and 4 to get -8.
7\sqrt{2}
Combine 15\sqrt{2} and -8\sqrt{2} to get 7\sqrt{2}.