00:01
All right, so suppose i want to factor this.
00:02
How am i going to factor this? well, one way to do that is we could do the box and the area model method.
00:09
So i'm going to put the first and the last term here, 5x squared and minus 5.
00:14
On top of here, i'm going to multiply 5x squared by minus 5, the first and last term, 25x squared.
00:20
And then down bottom, i'm going to put the middle term.
00:24
Now the trick here that i'm thinking is i'm looking for what multiplies to negative 25, that adds negative 24.
00:32
So what are some factors of negative 25? well, one and negative 25, negative one and 25, or five and negative five.
00:42
Five and negative five won't add to negative 24.
00:44
These are close.
00:45
The one that gives me negative 24 is the first one.
00:47
So one, negative 25, add x's to it and move them back into the box.
00:54
Now in the box, i'm going to think, okay, what can i divide both terms by to get out of the box? they're both negative here and i can divide both by five...