9. x=2, u=−3
11. x=−1, y=3
13. x=2, y=1
15. ∅
17.
[0521]
[2127]
[−3−9−6−12]
[55618]
[105211]
[6231013]
19. a, b, d, e, and f are not defined.
[−612−9−15]
21.
⎡⎣⎢7−12111−144⎤⎦⎥
⎡⎣⎢1−3−2−19−1−10−2⎤⎦⎥
⎡⎣⎢−12600−1503−6−3⎤⎦⎥
⎡⎣⎢6−8−4−223−2−32−3⎤⎦⎥
⎡⎣⎢46021747−72118⎤⎦⎥
⎡⎣⎢6−21−1316−1−716−10⎤⎦⎥
23.
⎡⎣⎢444300−373⎤⎦⎥
⎡⎣⎢−22018−2−33−3⎤⎦⎥
⎡⎣⎢−3−9−6−6−1239−150⎤⎦⎥
⎡⎣⎢−372420−5−911−6⎤⎦⎥
⎡⎣⎢16442812121209−3⎤⎦⎥
⎡⎣⎢−922−1414−2−1513−22⎤⎦⎥
25. X=[−41−2510]
27. X=⎡⎣⎢⎢032212−124⎤⎦⎥⎥
29. X=⎡⎣⎢⎢−4−12−49232−4⎤⎦⎥⎥
31. X=⎡⎣⎢⎢12−2−94−5212−5⎤⎦⎥⎥
33.
AB=[461123]
BA=[118026]
35.
AB=[437−12]
BA=⎡⎣⎢−13−13845−41060⎤⎦⎥
37.
AB=[16]
BA=⎡⎣⎢2−483−6125−1020⎤⎦⎥
39.
AB=[78−8]
The product BA is not defined.
41.
AB=⎡⎣⎢107107191240⎤⎦⎥
BA=⎡⎣⎢701948185314⎤⎦⎥
43. AB=⎡⎣⎢131361781326⎤⎦⎥≠⎡⎣⎢62112211−119610⎤⎦⎥=BA
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