Nomer 18 jawabanya gimana

Bab Eksponensial
Matematika SMP Kelas IX

^ = pangkat

16^(x - 2) = (1/4)^(x² - 4x + 1)
(2^4)^(x - 2) = (2^(-2))^(x² - 4x + 1)
4(x - 2) = (-2) (x² - 4x + 1)
4x - 8 = -2x² + 8x - 2
2x² + 4x - 8x - 8 + 2 = 0
2x² - 4x - 6 = 0
x² - 2x - 3 = 0
(x - 3) (x + 1) = 0
x - 3 = 0
x = 3

x + 1 = 0
x = -1

✩✩ D ✩✩