Question

Tolong jawab soal di gambar ini tentang matriks sma

Answer 1

Det  matriks kiri = det matriks kanan
(x+2)(x-1) - 3(2) = (x-5)(x+4)  - 2(-1)
x² + x - 2 - 6 = x² -x - 20 + 2
x² + x - 8 = x² - x - 18
x + x = -18 + 8
2x = -10
x = - 5