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

/* code_begins */

{{{

m=matrix(QQ,[[-1,2,2],[2,-1,2],[2,2,-1]])
m.inverse()

}}}

/* code_ends */

 * '''Solution by''': 
   * Akash Singh, Student, CRCE