Thursday, December 26, 2013

What is x if log(6) ( x+41 ) - log(6) (x+1) = 2 ?

log6 (x+ 41) - log6 (x+1) =
2


First we will find the
domain.


==> x+ 41>0 ==>  x >
-41


==> x + 1 > 0 ==> x >
-1


==> Then the domain is x > -1
.....(1) 


We will use the logarithm properties to solve for
x.


We know that log a - log b= log
(a/b)


==> log6 (x+41) / (x+1)
=2


Now we will rewrite using the exponent
form.


==> (x+41)/(x+1) =
6^2


==> (x+41)/ (x+1) =
36


Multiply by x+1


==>
x+ 41 = 36(x+1)


==> x+ 41 = 36x +
36


==> 35x =
5


=> x = 5/35 =
1/7


==> x= 1/7 > -1 ( then the solution
within the domain.)


Then the solution is x=
1/7

No comments:

Post a Comment

What accomplishments did Bill Clinton have as president?

Of course, Bill Clinton's presidency will be most clearly remembered for the fact that he was only the second president ever...