x^2-3x-4y^2+6y x^2-25y^2-6x+9 x^2-x+3-3x

x^2-3x-4y^2+6y
x^2-25y^2-6x+9
x^2-x+3-3x

0 bình luận về “x^2-3x-4y^2+6y x^2-25y^2-6x+9 x^2-x+3-3x”

  1. `a)x^2-3x-4y^2+6y`

    `=(x^2-4y^2)-(3x-6y)`

    `=(x-2y)(x+2y)-3(x-2y)`

    `=(x-2y)(x+2y-3)`

    `b)x^2-25y^2-6x+9`

    `=(x^2-6x+9)-25y^2`

    `=(x-3)^2-(5y)^2`

    `=(x-3+5y)(x-3-5y)`

    `c)x^2-x+3-3x`

    `=(x^2-x)+(3-3x)`

    `=-x(1-x)+3(1-x)`

    `=(1-x)(3-x)`

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  2. a/ $x^2-3x-4y^2+6y\\=(x^2-4y^2)-(3x-6y)\\=(x-2y)(x+2y)-3(x-2y)\\=(x-2y)(x+2y-3)$

    b/ $x^2-25y^2-6x+9\\=(x^2-6x+9)-25y^2\\=(x-3)^2-25y^2\\=(x-5y-3)(x+5y-3)$

    c/ $x^2-x+3-3x\\=(x^2-x)-(3x-3)\\=x(x-1)-3(x-1)\\=(x-3)(x-1)$

     

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