Evaluate
85-\sqrt{5}\approx 82.763932023
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90+9\sqrt{5}-10\sqrt{5}-\left(\sqrt{5}\right)^{2}
Apply the distributive property by multiplying each term of -9+\sqrt{5} by each term of -10-\sqrt{5}.
90-\sqrt{5}-\left(\sqrt{5}\right)^{2}
Combine 9\sqrt{5} and -10\sqrt{5} to get -\sqrt{5}.
90-\sqrt{5}-5
The square of \sqrt{5} is 5.
85-\sqrt{5}
Subtract 5 from 90 to get 85.
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