Evaluate
-25\sqrt{5}\approx -55.901699437
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-5\times 5\sqrt{5}
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}.
-25\sqrt{5}
Multiply -5 and 5 to get -25.
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