00:01
In this question we have given that px equals to minus 0 .04x square plus 240x minus 10000.
00:16
We have to derivate it, derivate px with respect to x.
00:28
Hence px is equal to dy by dx of minus 0 .04x square plus 240x minus 10000.
00:42
Here we derivate it with respect to x minus 0 .04 dy by dx of x square plus 240 dy by dx of x minus dy by dx of 10000.
01:06
Now solving it we get minus 0 .04 into 2x plus 240 minus 0.
01:23
We get p dash x equals to minus 0 .08x plus 240.
01:33
Now p dash x equals to 0.
01:43
So minus 0 .08x plus 240 is equal to 0.
01:50
Here minus 0 .08x equals to minus 240.
01:55
Minus sign is cancelled out by minus sign.
01:59
So we get x equals to 240 by 0 .08.
02:05
We get x equals to 3000.
02:09
We get the value of x.
02:13
Now p double dash x equals to dy by dx of minus 0 .08x plus 240...