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

/* code_begins */

{{{
a = matrix([[26,-2,2],[2,21,4],[4,2,28]])
a
b = a.eigenvalues()
b
c = []
sum = 0
for i in range(len(b)):
      c.append(b[i]^2)
      sum = sum + c[i]
print sum
}}}

/* code_ends */

 * '''Solution by''': 
   * <prasad>, <student>, <Organization>
   * <Your Name>, <Profession>, <Organization>