Evaluate
9\sqrt{5}-30\approx -9.875388203
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9\sqrt{5}-6\left(\sqrt{5}\right)^{2}
Use the distributive property to multiply 3\sqrt{5} by 3-2\sqrt{5}.
9\sqrt{5}-6\times 5
The square of \sqrt{5} is 5.
9\sqrt{5}-30
Multiply -6 and 5 to get -30.
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Limits
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