Question 1672
 for a real(a,b,c) equation of order 3. 
(since f(x) --> +oo or -oo as x-->oo (or -oo))

 1. may have one or three zeros(real solutions.)
    may have one real solution and two complex zeros.    
 2. minimum number of (real) solutions is 1.
   max number of (real) solutions is 3.
   the number of (real) solutions may be 2. (if a real double root,
   e.g. (x-1)^2 (x+3)=0)
   
   
 Kenny