It is proved that the equation x ^ 3-6x + 2 = 0 has at least one real root in the interval (2,3)

It is proved that the equation x ^ 3-6x + 2 = 0 has at least one real root in the interval (2,3)

Let f (x) = x ^ 3-6x + 2 have f (2) * f (3) > 0. It is obvious that f (2) * f (3)