Evaluate
20\sqrt{3}\approx 34.641016151
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\sqrt{20\times 4\left(20-5\right)\left(20-19\right)}
Subtract 16 from 20 to get 4.
\sqrt{80\left(20-5\right)\left(20-19\right)}
Multiply 20 and 4 to get 80.
\sqrt{80\times 15\left(20-19\right)}
Subtract 5 from 20 to get 15.
\sqrt{1200\left(20-19\right)}
Multiply 80 and 15 to get 1200.
\sqrt{1200\times 1}
Subtract 19 from 20 to get 1.
\sqrt{1200}
Multiply 1200 and 1 to get 1200.
20\sqrt{3}
Factor 1200=20^{2}\times 3. Rewrite the square root of the product \sqrt{20^{2}\times 3} as the product of square roots \sqrt{20^{2}}\sqrt{3}. Take the square root of 20^{2}.
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