brookedoane11201 brookedoane11201

22-05-2018
Mathematics

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coefficient of x^2 in expansion of (x+2)^5

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sqdancefan sqdancefan

22-05-2018

The x² term will be C(5,2)x²·2³ = 80x².

The coefficient is 80.

_____
C(n, k) = n!/(k!·(n-k)!)
C(5, 2) = 5·4/(2·1) = 10

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