i'm trying to bone up on my pre-calc and calc for a placement exam in a couple weeks. the school gave me some guidance on review and one of the sites they reference is "calculus on the web" which is supported by temple univ. in the logarithmic equations section of their pre-calculus book i came across three problems i can't seem to get the correct solutions for:

#6) ln (9 - x

^{2}) = 2

#10) ln (-3x + 1) = ln 2x + 3

and #15) ln (x

^{3}- 2) = ln ( 4x

^{2}- 5x)

if anyone out there could lend a hand it would be most appreciated. thanks very much in advance.

tim