00:02
So i have a rational function, and i want to start by finding the domain of this function.
00:12
The domain is all the values that don't make the denominator zero.
00:18
So i'm going to start off by factoring the denominator, and that's going to factor x plus 5 times x minus 2.
00:27
So x can't be negative 5, nor can x be 2.
00:32
In interval notation, that'll be negative.
00:35
Infinity negative 5, negative 5, 2, 2 positive infinity, with union symbols joining them.
00:46
So that is my domain.
00:52
Vertical asymptopes occur where the denominator equals zero after the function is in lowest terms.
01:04
This function is in lowest terms because it has nothing to cancel.
01:09
There are no common factors to cancel.
01:12
I'm going to have vertical asymptopes at the undefined values, x equals 5 and x equals 2.
01:19
And they need to be in that form x equals.
01:32
Now i want to define the behavior near those asymptopes.
01:41
So we're going to talk about the first asymptope on the left first.
01:48
So let's see, as x approaches negative 5 from the left, f of x is going to go to negative infinity...