Evaluate
-10\sqrt{2}\approx -14.142135624
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\sqrt{5}\left(-2\right)\sqrt{5}\sqrt{2}
Factor 10=5\times 2. Rewrite the square root of the product \sqrt{5\times 2} as the product of square roots \sqrt{5}\sqrt{2}.
5\left(-2\right)\sqrt{2}
Multiply \sqrt{5} and \sqrt{5} to get 5.
-10\sqrt{2}
Multiply 5 and -2 to get -10.
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