matriks mencari nilai x

|A| = |B|
(2x . x) - (3 . 3) = (x . 10) - ((-1) . 3)
2x² - 9 = 10x - (-3)
2x² - 9 = 10x + 3
2x² - 10x - 9 - 3 = 0
2x² - 10x - 12 = 0
(2x + 2)(x - 6) = 0

2x + 2 = 0
2x = -2
x = -1

atau

x - 6 = 0
x = 6