Evaluate
8\sqrt{1105}\approx 265.932322218
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\sqrt{20\times 13\left(20-3\right)\left(20-4\right)}
Subtract 7 from 20 to get 13.
\sqrt{260\left(20-3\right)\left(20-4\right)}
Multiply 20 and 13 to get 260.
\sqrt{260\times 17\left(20-4\right)}
Subtract 3 from 20 to get 17.
\sqrt{4420\left(20-4\right)}
Multiply 260 and 17 to get 4420.
\sqrt{4420\times 16}
Subtract 4 from 20 to get 16.
\sqrt{70720}
Multiply 4420 and 16 to get 70720.
8\sqrt{1105}
Factor 70720=8^{2}\times 1105. Rewrite the square root of the product \sqrt{8^{2}\times 1105} as the product of square roots \sqrt{8^{2}}\sqrt{1105}. Take the square root of 8^{2}.
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