因式分解x^2-2xy-3y^2+8y-4
问题描述:
因式分解x^2-2xy-3y^2+8y-4
答
原式=(x²-2xy+y²)-(4y²-8y+4)
=(x-y)²-(2y-2)²
=(x-y+2y-2)(x-y-2y+2)
=(x+y-2)(x-3y+2)