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

/* code_begins */

{{{
#15.
a = matrix(QQ,[3,0,4])
b = matrix(QQ,[-1,8,2])
c = matrix(QQ,3,[9,5,7])
d = matrix(QQ,3,[2,-2,6])
print 6*a-5*a
print transpose(transpose(a))-a
#transpose(a)-a
print "undefined since order of a is not equal to order of transpose of a"}}}

/* code_ends */

 * '''Solution by''': 
   * <Grishalda>, <Lecturer>, <St. Francis Institute of Technology>
   * <Your Name>, <Profession>, <Organization>