Since f is the sum of the polynomial and (-1) , f is differentiable and continuous for all x.By the Intermediate Value Theorem, there is at least a number c in (0, ) such that .Thus, the given equation has at least one real root in [0, ].We prove that there is exactly one real root in [0, ] by the method of contradiction.If the given equation has two distinct real roots a and b in [0, ] with a