Question

把多项式X＾2-Y＾2-2X－4Y-3因式分解

Answer 1

x^2-y^2-2x-4y-3

=x^2-2x+1-y^2-4y-4

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

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

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

=(x+y+1)(x-y-3)