Evaluate
15\sqrt{5}-4\approx 29.541019662
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3\times 5\sqrt{5}-\sqrt{16}
Factor 125=5^{2}\times 5. Rewrite the square root of the product \sqrt{5^{2}\times 5} as the product of square roots \sqrt{5^{2}}\sqrt{5}. Take the square root of 5^{2}.
15\sqrt{5}-\sqrt{16}
Multiply 3 and 5 to get 15.
15\sqrt{5}-4
Calculate the square root of 16 and get 4.
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