Evaluate
51\sqrt{379721}-3\sqrt{13717421}\approx 20315.856992376
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51\sqrt{379721}-\sqrt{123456789}
Factor 987654321=51^{2}\times 379721. Rewrite the square root of the product \sqrt{51^{2}\times 379721} as the product of square roots \sqrt{51^{2}}\sqrt{379721}. Take the square root of 51^{2}.
51\sqrt{379721}-3\sqrt{13717421}
Factor 123456789=3^{2}\times 13717421. Rewrite the square root of the product \sqrt{3^{2}\times 13717421} as the product of square roots \sqrt{3^{2}}\sqrt{13717421}. Take the square root of 3^{2}.
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