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

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{{{
#Kreyszig 309 Problemset6.1 problem 8
A = matrix(QQ,[[2,1],[1,7]])
B= matrix(QQ,[[-2,5],[0,8]])
C= matrix(QQ,[[6,0,3],[1,0,-5]])
D= matrix(QQ, [[4,0,-4],[-3,4,9]])
print 6*transpose(transpose(C)+3*transpose(D))
print 6*C+18*D}}}

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 * '''Solution by''': 
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