Tentukan inves dan determinan dari A = | 5 7 | = ? | 3 4 |

Det A = 20-21 = -1
adj A = ( 4 -7)
(-3 5)

invers A
1/det A x adj A
1/-1 x ( 4 -7 )
(-3 5)
-1 (4 -7)
(-3 5)
(-4 7)
(3 -4)