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Math Help - I hate Factorization!

  1. #1
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    I hate Factorization!

    Q: Factorize 51y^2 - 2580y - 39879.


    Please help if you can.

    Many thanks.
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  2. #2
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    Wink

    Quote Originally Posted by isuckatmaths View Post
    Q: Factorize 51y^2 - 2580y - 39879.
    Simplifying
    51y2 -2580y -39879
    First, you need to reorder the terms then factor the GCF that will be 3
    3(-13293 + -860y + 17y2)
    then factor a trinomial
    3[(-211 -17y)(63 -y)]so the final result is3(-211-17y)(63 -y)
    i'm not sure bout this. i just tried. you can check it.
    Last edited by princess_21; January 20th 2009 at 08:14 AM.
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  3. #3
    MHF Contributor red_dog's Avatar
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    51y^2-2580y-39879=51(y-y_1)(y-y_2)

    where y_{1,2}=\frac{-b\pm\sqrt{b^2-4ac}}{2a} and a=51, \ b=-2580, \ c=-39879
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  4. #4
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    Hello, isuckatmaths!

    This is The Trinomial From Hell (coming to a theater near you).


    Factor: . 51y^2 - 2580y - 39879

    Factor out 3: . 3(17y^2 - 860y - 13293)


    There are a number of ways to factor this ugly trinomial.
    . .
    I hope you know at least one.


    Answer: . 3(x - 63)(17x + 211)

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  5. #5
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    Red face

    Quote Originally Posted by Soroban View Post
    Hello, isuckatmaths!

    This is The Trinomial From Hell (coming to a theater near you).


    Factor out 3: . 3(17y^2 - 860y - 13293)


    There are a number of ways to factor this ugly trinomial.
    . . I hope you know at least one.


    Answer: . 3(x- 63)(17x + 211)
    change x to y
    3(y- 63)(17y + 211)
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