00:01
Okay, so we have these two functions here, f of r, equal to r squared plus 3r plus 7, and p of r equal to negative 2r plus 3.
00:09
We want to find the point of intersection, so therefore we just go ahead and we set these functions equal to each other.
00:17
Therefore, we have r squared plus 3r plus 7 is equal to negative 2r plus 3.
00:25
And let's go ahead and solve for r.
00:27
Well, let's go ahead and set this equal to zero.
00:30
So let's add 2r to both sides and subtract 3.
00:34
So we still have an r squared.
00:36
Then we have, while we add 2r, so we have 3r plus 2r, which is plus 5r, and then we subtract 3.
00:44
So 7 minus 3 is 7, 6, 5, 4.
00:47
So we have a plus 4.
00:50
Okay, so therefore we have r squared plus 5r plus 4 is then equal, well, to 0.
00:57
And then we can go ahead and factor this.
00:59
We have a quadratic...