Evaluate
3\sqrt{5}\approx 6.708203932
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\sqrt{\left(\frac{20}{2}-1\right)\times 5}
Multiply 5 and 4 to get 20.
\sqrt{\left(10-1\right)\times 5}
Divide 20 by 2 to get 10.
\sqrt{9\times 5}
Subtract 1 from 10 to get 9.
\sqrt{45}
Multiply 9 and 5 to get 45.
3\sqrt{5}
Factor 45=3^{2}\times 5. Rewrite the square root of the product \sqrt{3^{2}\times 5} as the product of square roots \sqrt{3^{2}}\sqrt{5}. Take the square root of 3^{2}.
Examples
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