Evaluate
-10
Factor
-10
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\left(-\sqrt{5}\right)\times 2\sqrt{5}
Factor 20=2^{2}\times 5. Rewrite the square root of the product \sqrt{2^{2}\times 5} as the product of square roots \sqrt{2^{2}}\sqrt{5}. Take the square root of 2^{2}.
-2\sqrt{5}\sqrt{5}
Multiply -1 and 2 to get -2.
-2\times 5
Multiply \sqrt{5} and \sqrt{5} to get 5.
-10
Multiply -2 and 5 to get -10.
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