Evaluate
51.49-2\sqrt{5}\approx 47.017864045
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62.49-2\left(2+\sqrt{5}\right)-7
Multiply -1 and 2 to get -2.
62.49-4-2\sqrt{5}-7
Use the distributive property to multiply -2 by 2+\sqrt{5}.
58.49-2\sqrt{5}-7
Subtract 4 from 62.49 to get 58.49.
51.49-2\sqrt{5}
Subtract 7 from 58.49 to get 51.49.
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