3. It is proved that the equation x ^ 5-3x = 1 has at least one root between 1 and 2

3. It is proved that the equation x ^ 5-3x = 1 has at least one root between 1 and 2

Certificate: x ^ 5-3x-1 = 0
∵ when x = 1, x ^ 5-3x-1 = - 30
The equation x ^ 5-3x = 1 has at least one root between 1 and 2