作业帮分解因式x²-y²-6x-9
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分解因式x²-y²-6x-9
分解因式x²-y²-6x-9
分解因式x²-y²-6x-9
x²-y²-6y-9
=x²-(y²＋6y＋9)
=x²-(y+3)²
=(x+y+3)(x-y-3)
x²-y²-6x-9=（x-3)^2-y^2-18=(x-3+y)(x-3-y)-18
x²-y²-6x-9
=x²-6x+9-y²-18
=（x-3）²-y²-18
=(x+y-3)(x-y-3)-18