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10\sqrt{10}-2\sqrt{40}
Factor 1000=10^{2}\times 10. Rewrite the square root of the product \sqrt{10^{2}\times 10} as the product of square roots \sqrt{10^{2}}\sqrt{10}. Take the square root of 10^{2}.
10\sqrt{10}-2\times 2\sqrt{10}
Factor 40=2^{2}\times 10. Rewrite the square root of the product \sqrt{2^{2}\times 10} as the product of square roots \sqrt{2^{2}}\sqrt{10}. Take the square root of 2^{2}.
10\sqrt{10}-4\sqrt{10}
Multiply -2 and 2 to get -4.
6\sqrt{10}
Combine 10\sqrt{10} and -4\sqrt{10} to get 6\sqrt{10}.