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Math Help - Urgent!! Factoring with Box Method!

  1. #1
    MP3
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    Urgent!! Factoring with Box Method!

    Hi i have an exam in the comming days and i need help factoring quadratics with the box method

    2y^2-y-15
    Can anyone factor this and explain? thanks!
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  2. #2
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    Quote Originally Posted by MP3 View Post
    Hi i have an exam in the comming days and i need help factoring quadratics with the box method

    2y^2-y-15
    Can anyone factor this and explain? thanks!
    2y^2 - y - 15
    We have a=2; b=-1; c=-15;
    Which means ac=-30;
    Find factors of -30 that add up to -1;
    In this case, 5 and -6;

    Then, draw your box:
    | 2y^2 ....| ******|
    | ********| -15 **|

    Add the numbers you found as y multipliers;

    | 2y^2 | 5y |
    | -6y...| -15 |

    Then, find the common factors of each row and column to get;

    ............2y........+5........

    y....... | 2y2^2 | 5y |
    -3.......| -6y.....| -15|

    You now have the following (y-3)(2y+5);

    Try it yourself to see if it works.
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  3. #3
    Super Member dhiab's Avatar
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    Quote Originally Posted by mp3 View Post
    hi i have an exam in the comming days and i need help factoring quadratics with the box method

    2y^2-y-15
    can anyone factor this and explain? Thanks!
    hello i'have anathor resolution :
    Attached Files Attached Files
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    Quote Originally Posted by dhiab View Post
    hello i'have anathor resolution :
    That is also possible indeed, but the OP requested the box method.
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  5. #5
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    Quote Originally Posted by MP3 View Post
    ...i need help factoring quadratics with the box method
    For a lesson specific to this method, try here.
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