#1405 · Algebra · Polynomials

Coefficient of power with two variables

Find the coefficient of $x^{18}$ in $(a x^{4} - b x)^{9}$ .

~6 minAnswer checked instantlyBinomial TheoremGeneral Term

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XIII. Binomial Theorem: Positive Integral Index, Examples XIII.a, No. 28

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