00:01
We're asked to look at an expression and see if we can factor it.
00:05
So the expression that we have is going to be q squared minus q minus 42.
00:15
Okay.
00:17
So we want two integers whose product is negative 42 and whose sum is negative 1 because it's negative 1 q.
00:26
And i'm just going to make this like that.
00:28
So we don't think it's a 9.
00:31
Okay.
00:31
So we need to find the factors of negative 42.
00:35
So what times what is going to give us negative 42? so we have negative 21, positive 2.
00:42
21, negative 2.
00:45
We have a negative 14 and 3.
00:47
We have 14 and negative 3.
00:51
And then we also have negative 7 and 6.
00:57
And then we have 7 and negative 6.
01:00
So then we need to go back in and find the sum of those.
01:03
So negative 21 plus negative 21 plus 2...