Binomial expansion with square root of a constant

Expand the expression $(9 + 2 x)^{\frac{1}{2}}$ up to 4 terms in ascending powers of $x$ .

~6 minAnswer checked instantlyBinomial TheoremSeries Expansion

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XIV. Binomial Theorem: Any Index, Examples XIV.a, No. 12

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).