Evaluate
4\sqrt{19}\approx 17.435595774
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2\sqrt{2}\sqrt{2}\sqrt{19}
Factor 38=2\times 19. Rewrite the square root of the product \sqrt{2\times 19} as the product of square roots \sqrt{2}\sqrt{19}.
2\times 2\sqrt{19}
Multiply \sqrt{2} and \sqrt{2} to get 2.
4\sqrt{19}
Multiply 2 and 2 to get 4.
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