Evaluate
10\sqrt{2}\approx 14.142135624
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2\sqrt{2}+8\sqrt{2}
Factor 128=8^{2}\times 2. Rewrite the square root of the product \sqrt{8^{2}\times 2} as the product of square roots \sqrt{8^{2}}\sqrt{2}. Take the square root of 8^{2}.
10\sqrt{2}
Combine 2\sqrt{2} and 8\sqrt{2} to get 10\sqrt{2}.
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