00:02
Now, let's solve this exercise.
00:04
First, the function fx equals extra power of 4 minus 3x cubed plus 2x squared minus x plus 1.
00:19
First, we want to know the derivative of this function, which is 4 times x to a power 4 minus 1, minus 1, plus 3, sorry, minus 3 times 3 times x to a power of 3 minus 1, plus 2 times 2 times x to a power of 2 minus 1, minus 1.
00:55
And the derivative of a constant is just 0.
00:59
And we can simplify the expression, which is 4x cubed minus 9x squared plus 4x minus 1.
01:15
And next we want to know the snob of this function at x equals 2.
01:25
And hence we just substitute x with 2 into this expression, which is a substitute 2 into this expression, which is 4 times 2 cubed minus 9 times 2 squared plus 8, sorry 4 times 2 minus 1, which is 4 times 8 minus 9 times 4 plus 8 minus 1, which is 32 minus 36 plus 8 plus 8 minus 1, which is 32 minus 36 plus, plus 32 ,000, plus 3 ,000.
02:06
Plus a minus 1, which is minus 4 plus 7, which is 3...