Lemma
EasyBinomial theorem
OpenStax, Intermediate Algebra 2e §12.4 Binomial Theorem · Try It 15 · Algebra · Binomial theorem

Binomial Theorem · Try It 15

Find the third term of

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OpenStax, Intermediate Algebra 2e · §12.4 Binomial Theorem · Try It 15

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Checked against the answer in OpenStax, Intermediate Algebra 2e.