00:01
Here, we're given the cost and the revenue, and we want to find the profit.
00:05
The profit is just going to be the revenue minus the cost.
00:10
So that is going to be 1 .38q.
00:12
Sorry, i dropped that q there.
00:13
1 .38q minus 0 .001 q squared minus the cost.
00:20
So i'm going to distribute that one everywhere to the cost.
00:22
So minus 350, minus 0 .36q, and again, minus 0 .003 squared.
00:33
So if i combine the constant terms, i have, well, let's start with the quadratic terms, actually.
00:39
We have negative 0 .004, because that's 3 plus 1, q squared.
00:45
And i'm going to go ahead and cross those out just to make sure i got those already...