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Verified answer
9) log(x-2)+log (x+1) < 2log (x+4)log (x-2) + log (x+1) < log (x+4)²
log (x-2).(x+1) < log (x+4)(x+4)
x²-x -2 < x² +16 + 8x
x²- x² -x -8x -2 -16 < 0
-9x < 18
x > 2 (a)
10) ²log (x+2) + ² log (x-2) « ²log5
²log (x+2)(x-2) « ²log 5
x²-4 « 5
x² -9 « 0
(x-3)(x+3) « 0
x= 3 atau x = -3
_++_-3__---__3__++__
tanda lebih kecil pilih negatif
HP ( -3« x« 3)