Posted by Laura Grace on Wednesday, March 23, 2011 at 9:55pm.
Solve the lograthmic function:
ln(X+5) = ln(X1)  ln(X+1)
The answer has no solution but I do not know how to come to that answer. Help is greatly appreciated!

pre calc  Reiny, Wednesday, March 23, 2011 at 10:06pm
ln(x+5) = ln[(x1)/(x+1)]
x+5 = (x1)/(x+1)
(x+5)(x+1) = x1
x^2 + 6x + 5 = x1
x^2 + 5x + 6 = 0
(x+2)(x+3) = 0
x = 2 or x=3
but in ln(x1), x1>0 or x > 1
remember we can't take the log of a negative number and we would get ln(3) and ln(4) which would be undefined.
so neither of the solutions are valid, and
there is no solution to your equation.

pre calc  Laura Grace, Thursday, March 24, 2011 at 8:44pm
Thank you soo much!
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