Re: logarithm and arithimetical progression

From: quasi <quasi@xxxxxxxx>
Date: Tue, 12 Jun 2007 21:40:23 -0500

On Wed, 13 Jun 2007 01:01:51 -0000, "almeidabatista@xxxxxxx"
<almeidabatista@xxxxxxxxx> wrote:

Please help me solve this one:

"What is the value of x so that log4, log(x+7) and log(x+6) are, in
this order, in a arithimetical progression?"

PS: log stands for logarithm base 10.

Hints:

If a,b,c are in arithmetic progression, what simple relationship must
hold between a,b,c?

Based on the above idea, write an equation involving log4, log(x+7),
and log(x+6).

Solve the equation for x.

Make sure to reject extraneous solutions.

quasi
.

Follow-Ups:
- Re: logarithm and arithimetical progression
  - From: almeidabatista@xxxxxxx

References:
- logarithm and arithimetical progression
  - From: almeidabatista@xxxxxxx

Prev by Date: JSH: Ok, what DOES amuse me
Next by Date: Re: An ulternative axiomatization of Ackermann set theory.
Previous by thread: Re: logarithm and arithimetical progression
Next by thread: Re: logarithm and arithimetical progression
Index(es):
- Date
- Thread