Evaluate
400\sqrt{5}\approx 894.427191
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\sqrt{800000}
Multiply 20000 and 40 to get 800000.
400\sqrt{5}
Factor 800000=400^{2}\times 5. Rewrite the square root of the product \sqrt{400^{2}\times 5} as the product of square roots \sqrt{400^{2}}\sqrt{5}. Take the square root of 400^{2}.
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