minima

The function $f(x) = x^3 - 27x + 4$, $1 \le x \le 6$ has

The function $f(x) = x^3 - 27x + 4$, $1 \leq x \leq 6$ has

Which one of the following is NOT a correct statement?

The function $$f\left( x \right) = 2{x^3} - 3{x^2} - 36x + 2\,\,\,$$ has its maxima at

The function $$f\left( x \right) = {x^3} - 6{x^2} + 9x + 25$$ has