因式分解:(1)x^2+3x-4 (2)x^3-xyz+x^2y-x^2z
问题描述:
因式分解:(1)x^2+3x-4 (2)x^3-xyz+x^2y-x^2z
答
x^2+3x-4
=(x+4)(x-1)
x^3-xyz+x^2y-x^2z
=x(x²-yz+xy-xz)
=x[x(x+y)-z(x+y)]
=x(x-z)(x+y)