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keanujones229 keanujones229
  • 27-08-2016
  • Mathematics
Answered

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

Verified Answer :

caylus
caylus caylus
  • 27-08-2016

Hello,

\((y^2 - x)^4=(-x)^{4}+4(-x)^{3}y^{2}+6(-x)^{2}y^{4}-4xy^{6}+y^{8}\)

Coefficient =6=(-1)^2 2P4=14*3/2!

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