请叔叔、阿姨，大哥哥、大姐姐来帮助我做出这道因式分解题吧，谢谢啦！

x^2-8xy+15y^2+2x-4y-3
=x^2+(2x-8xy)+(15y^2-4y-3)
=x^2+(2-8y)x+(5y-3)(3y+1)
=(x-5y+3)(x-3y-1)

这题太难了!,但你弄清楚三项数相加减后的和差再平方就迎刃而解了.
x^2-8xy+15y^2+2x-4y-3
=x^2-8xy+2x-8y+16y^2+1-y^2+4y-4
=(x-4y+1)^2-(y-2)^2
=(x-5y+3)(x-3y-1)