> seconddegree:= proc(a,b,c) 

 if a=0 then if b=0 and c=0 then print ('infinite solutions')  

elif b=0 and c<>0 then print ('impossible')  

elif b<>0 and c<>0 then print (' one solution',x=-(c)/(b))fi;   

delta:=b^(2)-4 *a*c;    

elif if delta=0 then print('double solution',x=-b/(2 a))  

elif delta >0 then print ('exist two  solutions',x1=((-b+sqrt(delta...