find factor: x^2-2xy+y^2+3x-3y-4
\(x^2-2xy+y^2+3x-3y-4\\ =(x^2-2xy+y^2)+(3x-3y)-4\\ =(x-y)^2+3(x-y)-4\\ \mbox{Let z=x-y}\\ =z^2+3z-4\\ =(z+4)(z-1)\\ =(x-y+4)(x-y-1) \)
Nice one, Melody.......I like how you did that.....!!!!
Thanks Chris,
It was a neat question. :)