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Math Help - Factoring Question

  1. #1
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    Factoring Question

    pretty easy question.. can't get answer in the back of the book though.

    x2 + 6y -y2 -9

    my answer
    (x-3)(x+3) + y(6-y)


    back of book
    (x+y-3)(x-y+3)
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  2. #2
    Master Of Puppets
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    x^2 + 6y -y^2 -9

    x^2  -y^2 + 6y-9

    x^2  -(y^2 - 6y+9)

    x^2  -(y- 3)^2

    Using the difference of two squares rule.

    (x -(y- 3))(x +(y- 3))

    (x -y+ 3)(x +y- 3)
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  3. #3
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    lol cant believe i missed that, thanks.
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