Yes. Do you remember what "DesCartes rule of signs" says? If the coefficients of a polynomial, in order from highest power to lowest, or vice versa, change sign n times, then the maximum number ofpositivezeros the polynomial can have is n and may be less than n with the difference from n an even number- n-2, n- 4, n- 6 etc. So a polynomial, with four positive zeros must be of degree at least 4 and the coefficients must have at least four changes of sign.