# Thread: Urgent!! Factoring with Box Method!

1. ## 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!

2. Originally Posted by MP3
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;

| 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.

3. Originally Posted by mp3
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 :

4. Originally Posted by dhiab
hello i'have anathor resolution :
That is also possible indeed, but the OP requested the box method.

5. Originally Posted by MP3
...i need help factoring quadratics with the box method
For a lesson specific to this method, try here.