Question

²log(x+2) + ²log (x-2) ≤²log 5 =....

Answer 1

²log (x + 2) + ²log (x - 2) ≤ ²log 5
²log (x + 2)(x - 2) ≤ ²log 5
x² - 4 ≤ 5
x² - 9 ≤ 0
(x + 3)(x - 3) ≤ 0
- 3 ≤ x ≤ 3
syarat logaritma:
x + 2 ≥ 0
x ≥ - 2
x - 2 ≥ 0
x ≥ 2 tapi x ≠ 2
diiris:
2 < x ≤ 3