Evaluate
-4\sqrt{5}-4\sqrt{6}\approx -18.742230881
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-2\times 2\sqrt{6}-\sqrt{5}-3\sqrt{5}
Factor 24=2^{2}\times 6. Rewrite the square root of the product \sqrt{2^{2}\times 6} as the product of square roots \sqrt{2^{2}}\sqrt{6}. Take the square root of 2^{2}.
-4\sqrt{6}-\sqrt{5}-3\sqrt{5}
Multiply -2 and 2 to get -4.
-4\sqrt{6}-4\sqrt{5}
Combine -\sqrt{5} and -3\sqrt{5} to get -4\sqrt{5}.
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