bata nilai x yg memenuhi pertidak samaan ³logx+³log(x+8)kurang lebih sama dengan2

Logaritma
SMA Kelas X

³log x + ³log (x + 8) ≤ 2
³log [x(x + 8)] ≤ ³log3²
³log (x² + 8x) ≤ ³log9

x² + 8x ≤ 9
x² + 8x - 9 ≤ 0
(x + 9)(x - 1) ≤ 0

x + 9 = 0
x = -9

x - 1 = 0
x = 1

++++++ -9 ---------- 1 ++++++

penyelesaian : -9 ≤ x ≤ 1