00:04
We're given z over z minus 9, one fraction, and 4 over z a second fraction, and asked to find the least common denominator.
00:12
A little bit harder when we throw variables in there, but it's still the same process.
00:16
We say, you know, if we wanted to, say, find the least common denominator for three -fourths and maybe five -ninths, well, we would need to change them both into the same denominator so we could add or subtract them, say.
00:31
So for this one, we would do four times nine and get 36 would be our least common denominator.
00:38
Well, it's the same thing that we're going to do here.
00:40
To find the least common denominator, i'm going to take this denominator, z minus 9, and then multiply it by the second denominator, which is z.
00:50
That is my least common denominator.
00:53
All right, so that is the least common denominator.
00:56
So what do we have to do now? well, we need to convert those to.
01:00
Least common denom.
01:03
All right.
01:04
So let's say that i want to take this fraction, and i want to put it over, and i like to write the z first for no good reason.
01:11
I want to write it over z times z minus 9, rather than just being over the original z minus 9.
01:18
So what did i do to the denominator of this one? well, i multiplied by z in the bottom...