Evaluate
-30\sqrt{2}\approx -42.426406871
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2\left(-3\right)\sqrt{5}\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}.
2\left(-3\right)\times 5\sqrt{2}
Multiply \sqrt{5} and \sqrt{5} to get 5.
-6\times 5\sqrt{2}
Multiply 2 and -3 to get -6.
-30\sqrt{2}
Multiply -6 and 5 to get -30.
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