Question

因式分解；x^2-2xy+y^2-1; x^2-4y^2+x-2y

Answer 1

(1) x^2-2xy+y^2-1=(x-y)^2-1=(x-y-1)(x-y+1)

(2) x^2-4y^2+x-2y=(x-2y*(x+2y)+x-2y=(x-2y)(x+2y+1)