Evaluate
40\sqrt{2}\approx 56.568542495
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4\sqrt{10}\sqrt{10}\sqrt{2}
Factor 20=10\times 2. Rewrite the square root of the product \sqrt{10\times 2} as the product of square roots \sqrt{10}\sqrt{2}.
4\times 10\sqrt{2}
Multiply \sqrt{10} and \sqrt{10} to get 10.
40\sqrt{2}
Multiply 4 and 10 to get 40.
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