||'''Book'''|| Advanced Engineering Mathematics ||
 ||'''Author'''|| Erwin Kreyszig ||
 ||'''Edition'''|| 8th Edition ||

/* code_begins */

{{{
D=var('D') 
y=solve(9*D**2+6*D+1==0,D)
print y 
}}}

/* code_ends */

 * '''Solution by''': 
   * sawankumar khillare, teaching,MGMs JNEC,Aurangabad
   * <Your Name>, <Profession>, <Organization>