Evaluate
2\sqrt{19}\approx 8.717797887
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\sqrt{4+5+7+9+51}
Add 1 and 3 to get 4.
\sqrt{9+7+9+51}
Add 4 and 5 to get 9.
\sqrt{16+9+51}
Add 9 and 7 to get 16.
\sqrt{25+51}
Add 16 and 9 to get 25.
\sqrt{76}
Add 25 and 51 to get 76.
2\sqrt{19}
Factor 76=2^{2}\times 19. Rewrite the square root of the product \sqrt{2^{2}\times 19} as the product of square roots \sqrt{2^{2}}\sqrt{19}. Take the square root of 2^{2}.
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