Evaluate
160\sqrt{42}\approx 1036.918511745
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40\times 4\sqrt{42}
Factor 672=4^{2}\times 42. Rewrite the square root of the product \sqrt{4^{2}\times 42} as the product of square roots \sqrt{4^{2}}\sqrt{42}. Take the square root of 4^{2}.
160\sqrt{42}
Multiply 40 and 4 to get 160.
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