Evaluate
-12\sqrt{10}\approx -37.947331922
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-6\sqrt{10}-2\times 3\sqrt{10}
Factor 90=3^{2}\times 10. Rewrite the square root of the product \sqrt{3^{2}\times 10} as the product of square roots \sqrt{3^{2}}\sqrt{10}. Take the square root of 3^{2}.
-6\sqrt{10}-6\sqrt{10}
Multiply -2 and 3 to get -6.
-12\sqrt{10}
Combine -6\sqrt{10} and -6\sqrt{10} to get -12\sqrt{10}.
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