Diketahui P = (7 3 9 4), Q = (2 1 5 8) dan PX = Q,
Matriks X = ...
A. (-7 -20 17 47)
B. (-7 20 -17 47)
C. (7 20 17 47)
D. (17 1 92 41)
E. (17 -1 92 41)
Pembahasan
PX = Q
X = P⁻¹Q
= 1 ⎧4 –3⎫⎧2 1⎫
74 – 39⎩–9 7⎭⎩5 8⎭
= 1 ⎧–7 –20⎫
1 ⎩17 47⎭
= ⎧–7 –20⎫
⎩17 47⎭
Jawaban: A