The known function f (x) = x Λ 3-6x Λ 2 + 9x-3 Finding the extremum of function f (x)

The known function f (x) = x Λ 3-6x Λ 2 + 9x-3 Finding the extremum of function f (x)

f '(x) = 3x^2-12x+9
When f '(x) = 0, 3x ^ 2-12x + 9 = 0
That is, (x-1) (x-3) = 0
The solution is X1 = 1, X2 = 3
When x 3, f '(x) > 0
Therefore, when x = 1, the original function has a maximum of 1; when x = 3, the original function has a minimum of - 3
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