00:01
In this question, we're given in a firm, the total revenue is given to be this and the total cost is given to be this.
00:09
We want to find the number of units that should be produced to maximize profit.
00:17
Now, q is measured in thousands.
00:22
So, i'm going to let p be the profit.
00:28
Profit is actually total revenue minus total cost.
00:31
So just put in the equation that we have.
00:41
And so simplifying, p will be minus 7q squared plus 24q minus 8.
00:49
Now let's differentiate p respect to q.
00:52
So dp dq.
00:54
There are three terms here separated by plus and minus.
00:57
So we'll do term by term differentiation.
01:00
For the first term, minus 7 is multiplied to the variable.
01:04
So it's kept aside.
01:05
Now, differentiating q square with respect to q, bring down the power 2, repeat the q and subtract 1 to the power.
01:15
Next, 24q.
01:17
24 is multiplied to q, so it's kept aside.
01:19
And q, when differentiated with respect to itself, is just 1...