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Q: 2 quick math questions ( No Answer,   2 Comments )
Subject: 2 quick math questions
Category: Reference, Education and News > Homework Help
Asked by: mreyland-ga
List Price: $3.00
Posted: 01 Aug 2006 15:05 PDT
Expires: 05 Aug 2006 09:50 PDT
Question ID: 751611
I have two math questions I need answers to. 

1. Directions. Expand

  log (x^3 / 10000)

2. Directions: Write as a single logarithm

 5lnx - 8lny
There is no answer at this time.

Subject: Re: 2 quick math questions
From: maplekiwi-ga on 01 Aug 2006 15:25 PDT
Use these equations for 'log' or 'ln':

   log( x / y)  =  log x  -  log y
   log( x^y )   =  y log x

Also, assuming that 'log' means 'log to the base 10':

   log 10 = 1
Subject: Re: 2 quick math questions
From: physicsarefun-ga on 05 Aug 2006 06:22 PDT
1. log (x^3 / 10000)
   = log x^3 - log 10^4
   = 3log x - 4

2. 5 ln x - 8 ln y
   = ln x^5 - ln y^8
   = ln (x^5 / y^8)

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