因式分解x^2-2xy-8y^2
问题描述:
因式分解x^2-2xy-8y^2
答
x^2-2xy-8y^2=x^2-2xy+y^2-9y^2=(x-y)^2-(3y)^2=(x-y+3y)(x-y-3y)=(x+2y)(x-4y)
因式分解x^2-2xy-8y^2
x^2-2xy-8y^2=x^2-2xy+y^2-9y^2=(x-y)^2-(3y)^2=(x-y+3y)(x-y-3y)=(x+2y)(x-4y)