Evaluate
2\sqrt{89}\approx 18.867962264
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\sqrt{256+10^{2}}
Calculate 16 to the power of 2 and get 256.
\sqrt{256+100}
Calculate 10 to the power of 2 and get 100.
\sqrt{356}
Add 256 and 100 to get 356.
2\sqrt{89}
Factor 356=2^{2}\times 89. Rewrite the square root of the product \sqrt{2^{2}\times 89} as the product of square roots \sqrt{2^{2}}\sqrt{89}. Take the square root of 2^{2}.
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