Question

Penyelesaian ²log(x-3) + ²log(x+3) ≥4 adalah ....

Answer 1

^2log (x - 3) + ^2log (x + 3) ≤ ^2log 16
^2log (x - 3)(x + 3) ≤ ^2log 16
x^2 - 9 ≤ 16
x^2 - 25 ≤ 0
(x + 5)(x - 5) ≤ 0
- 5 ≤ x ≤ 5
syarat logaritma:
x + 3 > 0
x > - 3
x - 3 > 0
x > 3
diiris:
-3 < x < 5