因式分解 2x^2+xy-y^2+x-5y-6
问题描述:
因式分解 2x^2+xy-y^2+x-5y-6
答
2x^2+xy-y^2+x-5y-6
=2x^2+(y+1)x-(y^2+5y+6)
=2x^2+(y+1)x-(y+2)(y+3)
=(2x-y-3)(x+y+2)