12-13 tolong bantu di kerjakan mohon ya

matriks singular, det A = 0
-10x - 60 = 0
-10x = 60
x = -6 (((D)))



AB = (4 3 baris di bawah 2 1)

det AB = -2

(AB) invers = -½ (1 -3 baris di bawah -2 4)
= (-½ 3/2 baris di bawahnya 1 -2)
(((E)))