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2\sqrt{8}+\left(5\sqrt{6}-7\sqrt{8}\right)\sqrt{3}
Multiply \sqrt{2} and \sqrt{2} to get 2.
2\times 2\sqrt{2}+\left(5\sqrt{6}-7\sqrt{8}\right)\sqrt{3}
Factor 8=2^{2}\times 2. Rewrite the square root of the product \sqrt{2^{2}\times 2} as the product of square roots \sqrt{2^{2}}\sqrt{2}. Take the square root of 2^{2}.
4\sqrt{2}+\left(5\sqrt{6}-7\sqrt{8}\right)\sqrt{3}
Multiply 2 and 2 to get 4.
4\sqrt{2}+\left(5\sqrt{6}-7\times 2\sqrt{2}\right)\sqrt{3}
Factor 8=2^{2}\times 2. Rewrite the square root of the product \sqrt{2^{2}\times 2} as the product of square roots \sqrt{2^{2}}\sqrt{2}. Take the square root of 2^{2}.
4\sqrt{2}+\left(5\sqrt{6}-14\sqrt{2}\right)\sqrt{3}
Multiply -7 and 2 to get -14.
4\sqrt{2}+5\sqrt{6}\sqrt{3}-14\sqrt{2}\sqrt{3}
Use the distributive property to multiply 5\sqrt{6}-14\sqrt{2} by \sqrt{3}.
4\sqrt{2}+5\sqrt{3}\sqrt{2}\sqrt{3}-14\sqrt{2}\sqrt{3}
Factor 6=3\times 2. Rewrite the square root of the product \sqrt{3\times 2} as the product of square roots \sqrt{3}\sqrt{2}.
4\sqrt{2}+5\times 3\sqrt{2}-14\sqrt{2}\sqrt{3}
Multiply \sqrt{3} and \sqrt{3} to get 3.
4\sqrt{2}+15\sqrt{2}-14\sqrt{2}\sqrt{3}
Multiply 5 and 3 to get 15.
4\sqrt{2}+15\sqrt{2}-14\sqrt{6}
To multiply \sqrt{2} and \sqrt{3}, multiply the numbers under the square root.
19\sqrt{2}-14\sqrt{6}
Combine 4\sqrt{2} and 15\sqrt{2} to get 19\sqrt{2}.