00:01
So, the f of x given to us is f of x equals 12x minus x cube.
00:10
So, now we will first derivate this f dash of x equals 12 minus 3x square.
00:18
So, now we will equate this with 0 to find critical points.
00:22
So, 12 minus 3x square.
00:25
So, x square equals 12 by 3 which is equals to 4.
00:30
So, x is equals to plus minus 2.
00:34
So, these are my critical points and the range given to us is 0 comma 3.
00:40
So, now this is my here this is my minus 2 and here this is my plus 2 and the range given to us is 0 and here it is 3.
00:52
So, now we will find f double dash of 0 f double dash of x.
00:56
So, f double dash of x equals minus 6x...