00:01
So this problem is solving by factory.
00:02
The nice thing is it's already solved.
00:04
So now we're moving on to the next piece of this, which is using the zero product property.
00:08
The zero product property allows us to take each of these individual factors and set them equal to zero.
00:13
If three things are going to be multiplying to get us to zero, and we know one of them or more has to be zero.
00:20
So i like to put these lines between the factors to make sure that i get every single factor in there.
00:25
So for this first one, i'm going to divide everything through by four, like it's the x is equal to zero.
00:29
In this one, i'm going to add 9 to both sides, so i get x is equal to 9, and then this one here i'm going to subtract 7 from both sides, so i get x equals negative 7.
00:37
All right, so then the last next thing that we're going to do here is take each of these answers, so i've got three of them, negative 7, 0, and 9, and we're going to plug that back in to check to make sure they work...