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#1**0 **

I don't see any really clever way of doing this. You can expand it using the binomial theorem to get

\(\left(2+\sqrt{3}\right)^9 = \sum \limits_{k=0}^9~\dbinom{9}{k}2^k~3^{(9-k)/2}\)

if you then expand all that out and combine things you'll have an expression that looks like

\(a + b \sqrt{3}\)

b above turns out to be 40545 so you'll need to take the square root of 3 out to 5 decimal places

Rom Sep 7, 2018