Diketahui matriks A = ![\left[\begin{array}{ccc}p&5&\\2q&3r&\\&&\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Dp%265%26%5C%5C2q%263r%26%5C%5C%26%26%5Cend%7Barray%7D%5Cright%5D "\left[\begin{array}{ccc}p&5&\\2q&3r&\\&&\end{array}\right]")
, B = ![\left[\begin{array}{ccc}5&-1&\\3&2&\\&&\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D5%26-1%26%5C%5C3%262%26%5C%5C%26%26%5Cend%7Barray%7D%5Cright%5D "\left[\begin{array}{ccc}5&-1&\\3&2&\\&&\end{array}\right]")
, C = ![\left[\begin{array}{ccc}-2&3&\\2&4&\\&&\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-2%263%26%5C%5C2%264%26%5C%5C%26%26%5Cend%7Barray%7D%5Cright%5D "\left[\begin{array}{ccc}-2&3&\\2&4&\\&&\end{array}\right]")
, dan 
adalah transpos matriks C. Nilai p + 2q + r yang memenuhi A + B = 2 adalah....
A. 10
B. 6
C. 2
D. 0
E. -4
A. 10
B. 6
C. 2
D. 0
E. -4
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Didapat nilai berikut:
p + 5 = -4
p = -9
2q + 3 = 6
2q = 3
3r + 2 = 8
3r = 6
r = 2
Sehingga,
p + 2q + r = -9 + 3 + 2
p + 2q + r = -4 [E]