Help me!!!X((z-y)^2)+2X(y-z)=?

X((z-y)^2)+2X(y-z)=?


X((z-y)^2) + 2X(y-z) = X(y-z)² + 2X(y-z)


化簡：
　X(y-z)² + 2X(y-z)
= X(y-z) [(y-z) + 2]
= X(y-z) (y-z+2)


展開：
　X(y-z)² + 2X(y-z)
= Xy² - 2Xyz + Xz² + 2Xy - 2Xz
= Xy² + Xz² - 2Xyz + 2Xy - 2Xz

你係咪要expansion 定係要計答案
下面係expansion
X((z-y)^2)-2X(z-y)
=(z-y)(X(z-y)-2X)
=(z-y)(Xz-Xy-2X)