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

{{{

m=matrix(QQ,[[1,8,-7],[0,1,3],[0,0,1]])
m.inverse()

}}}

/* code_ends */

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