1/4 log (x^2 -9) <-2

Kelas 10 Matematika
Bab Logaritma

^(1/4)log (x² - 9) < -2
^(1/4)log (x² - 9) < ^(1/4)log (1/4)^(-2)
x² - 9 > 16
x² - 9 - 16 > 0
x² - 25 > 0
(x + 5) (x - 5) > 0
x - 5 > 0
x > 5

x + 5 < 0
x < -5

syarat
x² - 9 > 0
(x + 3) (x - 3) > 0
x - 3 > 0
x > 3

x + 3 < 0
x < -3

Maka 
x < -5 atau x > 5