Tlg jwb no.70 y gan, tq

maaf kalo salah gan, jika salah mohon komentarnya :)

log (a^2/b^2) = 18
log (a/b)^2 = 18
2 . log (a/b) = 18
log (a/b) = 9
log a - log b = 9
log b - log a = -9
log (b/a) = -9

log (5 3√(8b/a))
= log (5 (2^3.b/a)^1/3)
= log (5 . 2 (b/a)^1/3)
= log (10 . (b/a)^1/3)
= log 10 + log (b/a)^1/3
= 1 + 1/3 . log (b/a)
= 1 + 1/3 (-9)
= 1 - 3
= -2