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2 log x ≤ log 4x+12
x^2 ≤ 4x+12
x^2-4x-12 ≤ 0
(x+2) (x-6) ≤ 0
x ≥ -2 atau x ≤ 6
2 log x ≤ log 4(x+3)
2 log x ≤ log (4x + 12)
log x² ≤ log (4x + 12)
Syarat
x² > 0
x > 0
dan
(4x +12) > 0
x > -3
x² ≤ 4x + 12
x² - 4x -12 ≤ 0
(x - 6) (x + 2) ≤ 0
-2 ≤ x ≤ 6
Jadi, hasil irisan 0 < x ≤ 6