First Three Terms of Product

Find the first three terms in the expansion of $\frac{1}{( 1 + x ) ^{2} 1 + 4 x}$ .

~8 minAnswer checked instantlyBinomial TheoremPower Series

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XIV. Binomial Theorem: Any Index, Examples XIV.b, No. 35

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