00:01
To subtract these two fractions, i'm going to have to have the common denominators.
00:07
So let's factor both of these fractions.
00:10
On the first, a factor of the denominators.
00:12
On the first one, this is a difference of squares.
00:15
So this will be x plus three times x minus three.
00:19
And the second one is already factored.
00:21
So i'll leave it as is.
00:23
Now you notice that this one on the right has x minus three, but it's missing an x plus three like this one has.
00:29
So what i'll do is i'll just go and multiply it by an x plus 3 and do the same thing to the top because i want to do the same thing top as bottom.
00:38
So what i get here is i actually get a 4x plus 3 times x plus 3 times x minus and i'll factor this here.
00:52
I'll do x times x is x squared...