因式分解3(y-z)的平方-(2y+z)(2y-z)

问题描述:

因式分解3(y-z)的平方-(2y+z)(2y-z)
因式分解3(y-z)^2-(2y+z)(-z+2y)

3(y-z)^2-(2y+z)(-z+2y)
=3y^2-6yz+3z^2-4y^2+z^2
=-y^2-6yz+4z^2