9x^2-y^2-4y-4=
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9x^2-y^2-4y-4=
![9x^2-y^2-4y-4=](/uploads/image/z/20165891-59-1.jpg?t=9x%5E2-y%5E2-4y-4%3D)
9x^2-y^2-4y-4
=9x^2-(y^2+4y+4)
=9x^2-(y+2)^2
=[3x+(y+2)][3x-(y+2)]
=(3x+y+2)(3x-y-2)
=9x^2-(y^2+4y+4)
=9x^2-(y+2)^2
=[3x+(y+2)][3x-(y+2)]
=(3x+y+2)(3x-y-2)
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