atobajayeoluwatosin3 atobajayeoluwatosin3

19-07-2020
Mathematics

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what is the coefficient of x⁴ in the expansion of ( 1 + x)(1-x)^n

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Chloegayleen16 Chloegayleen16

19-07-2020

Answer:

=(-1)^n (1-n)

Step-by-step explanation:

=coefficient of x^n in (1-x)^n + coefficient of x^n-1 in (1-x)^n

=(-1)^n ^nCn + (-1)^n-1 ^nCn -1

=(-1)^n (1-n)

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