keanujones229 keanujones229

27-08-2016
Mathematics

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Coefficient of y^4 x^2 in expansion of (y^2-x)^4

Respuesta :

27-08-2016

Hello,

[tex](y^2 - x)^4=(-x)^{4}+4(-x)^{3}y^{2}+6(-x)^{2}y^{4}-4xy^{6}+y^{8}[/tex]

Coefficient =6=(-1)^2 * 2P4=1*4*3/2!

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