Evaluate
20\sqrt{42}\approx 129.614813968
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\sqrt{16900-10^{2}}
Calculate 130 to the power of 2 and get 16900.
\sqrt{16900-100}
Calculate 10 to the power of 2 and get 100.
\sqrt{16800}
Subtract 100 from 16900 to get 16800.
20\sqrt{42}
Factor 16800=20^{2}\times 42. Rewrite the square root of the product \sqrt{20^{2}\times 42} as the product of square roots \sqrt{20^{2}}\sqrt{42}. Take the square root of 20^{2}.
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