Evaluate
420\sqrt{10}\approx 1328.156617271
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\sqrt{1764000}
Multiply 90 and 19600 to get 1764000.
420\sqrt{10}
Factor 1764000=420^{2}\times 10. Rewrite the square root of the product \sqrt{420^{2}\times 10} as the product of square roots \sqrt{420^{2}}\sqrt{10}. Take the square root of 420^{2}.
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