00:01
Here we have a function f of x is equal to 3x minus 1 over x plus 5, and we have to find the inverse of this function and then the domain and the range.
00:19
So the first thing we're going to do is we're going to work and try to find the inverse.
00:23
So we're going to replace f of x with y and then we're just going to rewrite 3x minus 1 over x plus 5.
00:31
Now let's deal with that x plus 5 by moving it to the other side and then we're going to distribute the y so that becomes xy plus 5y is equal to 3x minus 1.
00:46
Now from here we're going to want to solve for x so let's get all of the x's over to the right hand side and let's move everything else over to the left hand side.
00:56
So this will leave us with 5y plus 1 on the left is equal to 3x minus xy on the right.
01:03
We're going to factor out an x that becomes 3 minus y is equal to 5y plus 1.
01:11
So i'm going to move up here so now we'll divide out the 3 minus y from the right hand side that becomes 5y plus 1 over 3 minus y is equal to x.
01:25
In this case this is just a variable that's a placeholder.
01:30
So this is actually your inverse of your function.
01:36
So the inverse is 5y plus 1 all over 3 minus y...