Mohon bantuanyaaaaaa

A - xI = (1 ... 4) - x (1 ... 0) = (1 ... 4) - (x ... 0) = (1 - x ...... 4)
............. (2 .. 3) ..... (0 .. 1) .. (2 .. 3) .. (0 ... x) .. (2 ..... 3 - x)

|A - xI| = (1 - x)(3 - x) - 4(2)
0 = 3 - x - 3x + x^2 - 8
0 = x^2 - 4x - 5
=> (x - 5)(x + 1) = 0
=> x = 5 atau x = -1
Jumlah nilai-nilai x nya = 5 + (-1) = 4