Evaluate
-28\sqrt{5}\approx -62.60990337
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2\left(-7\right)\sqrt{2}\sqrt{2}\sqrt{5}
Factor 10=2\times 5. Rewrite the square root of the product \sqrt{2\times 5} as the product of square roots \sqrt{2}\sqrt{5}.
2\left(-7\right)\times 2\sqrt{5}
Multiply \sqrt{2} and \sqrt{2} to get 2.
-14\times 2\sqrt{5}
Multiply 2 and -7 to get -14.
-28\sqrt{5}
Multiply -14 and 2 to get -28.
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