分解因式x^2-3xy-10y^2+x+9y-2

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分解因式x^2-3xy-10y^2+x+9y-2

分解因式x^2-3xy-10y^2+x+9y-2
分解因式x^2-3xy-10y^2+x+9y-2

分解因式x^2-3xy-10y^2+x+9y-2
x^2-3xy-10y^2+x+9y-2
=(x+2y)(x-5y)+2x+4y-x+5y-2
=(x+2y)(x-5y)+2(x+2y)-(x-5y+2)
=(x+2y)(x-5y+2)-(x-5y+2)
=(x+2y-1)(x-5y+2)

=(x-5y)(x+2y)+x+9y-2
=(x-5y+2)(x+2y-1)