Evaluate
-12\sqrt{5}\approx -26.83281573
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6\sqrt{5}-6\times 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}.
6\sqrt{5}-18\sqrt{5}
Multiply -6 and 3 to get -18.
-12\sqrt{5}
Combine 6\sqrt{5} and -18\sqrt{5} to get -12\sqrt{5}.
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