Kak dibantu yaa,,, please

nilai determinan matriksnya = 0, berarti
(3x - 1)(x + 2) - 3(x + 1) = 0
3x² + 6x - x - 2 - (3x + 3) = 0
3x² + 5x - 2 - 3x - 3 = 0
3x² + 2x - 5 = 0
(3x + 5) (x - 1) = 0
x = -5/3   atau   x = 1

Bab Matriks
Matematika SMA Kelas X

[ (3x - 1)          3] = 0
[ (x + 1)   (x + 2)]

(3x - 1) . (x + 2) - 3 (x + 1) = 0
3x² + 6x - x - 2 - 3x - 3 = 0
3x² + 2x - 5 = 0
(3x + 5) (x - 1) = 0
3x + 5 = 0
3x = -5
x = -5/3

x - 1 = 0
x = 1

-5/3 atau 1

Jawabannya C