[tex]di bantu y[/tex]

diketahui Trace(D) = 15 *trace = jumlah diagonal utama*
maka
3x + x + 1 + 6 = 15
4x + 7 = 15
4x = 8
x = 2

karena D matriks simetris, maka 
x - y = 8
2 - y = 8
y = -6

z - 1 = 5
z = 6

D = Transpose(D)


jadi Transpose(D)
= [tex] \left[\begin{array}{ccc}6&8&10\\8&3&5\\10&5&6\end{array}\right] [/tex]