Evaluate
4\left(\sqrt{1299}+104\right)\approx 560.166570328
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4\sqrt{1299}+416
Factor 20784=4^{2}\times 1299. Rewrite the square root of the product \sqrt{4^{2}\times 1299} as the product of square roots \sqrt{4^{2}}\sqrt{1299}. Take the square root of 4^{2}.
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