It is proved that no matter what the value of B is, the equation x ^ 3-3x ^ 2 + B = 0 has at most one real root in the interval [0,1]

It is proved that no matter what the value of B is, the equation x ^ 3-3x ^ 2 + B = 0 has at most one real root in the interval [0,1]

Let f (x) = x ^ 3-3x ^ 2 + B
Then f ′ (x) = 3x & # 178; - 6x, it is easy to know that in the interval [0,1], f ′ (x) = 3x & # 178; - 6x