SOLUTION: Find domain of: ln(9-8x-x^2) a = b = I know this requires some log rules I am just lost on solving please help!

Question 914142: Find domain of: ln(9-8x-x^2)
a =
b =
I know this requires some log rules I am just lost on solving please help!
Found 2 solutions by ewatrrr, Fombitz:
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
ln(9-8x-x^2) = ln((x-9)(x+1))
Keep in mind the Parent Function ln(x)
'x' must be > 0 ..so (x-9)(x+1) as well needs to be > 0
recommend a good graphing calculator/software to familiarize Yourself with the various Parent Functions
FREE graph software https://www.padowan.dk/download/

...........
ln((x-9)(x+1)) domain (−∞, -1) U ( 9, ∞)

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
The only rule is that the argument be greater than zero.

Graphing the function,

The argument is positive between the values of and so the domain is,
(,)
Here's a graph of the function.

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