RULES OF LOGARITHMS - Problem 5

Let a be a positive number such that a does not equal 1, let n be a real number, and let u and v be positive real numbers.

Logarithmic Rule 3: tex2html_wrap_inline162 .

Problem 5: Simplify tex2html_wrap_inline164 and calculate the value.

Answer: - 3.487

Solution : There are many ways to work the above problem. We have included two of the ways.

Solution 1:

Step 1: First note that you are taking the log of an expression raised to a power; therefore, you use Rule 3. tex2html_wrap_inline164 can be written tex2html_wrap_inline168 .
Step 2: You will now be taking the log of a quotient; therefore, use Rule 2.

displaymath170

Step 3: You will now be taking logs of products; therefore, use Rule 1.

displaymath172

Step 4: You will now be taking logs of expressions raised to a power, use Rule 3.

displaymath174

Step 5: This last expression can be written

displaymath176

rounded to 3.487.

Step 6: You can check your answer by calculating directly from the initial expression.

displaymath178

Since both answers are the same, you have correctly worked the problem.

Solution 2:

Step 1: First note that you are taking the log of an expression raised to a power; therefore, you use Rule 3.

displaymath180

Step 2: Simplify the numerator and simplify the denominator: tex2html_wrap_inline168 can be written

displaymath184

Step 3: Calculate the logarithm:

displaymath186


If you want to work another problem, click on Next Problem.

[Previous Problem] [Next Problem] [Menu Back to Rule 3]

[Algebra] [Trigonometry] [Complex Variables]

S.O.S MATHematics home page

Do you need more help? Please post your question on our S.O.S. Mathematics CyberBoard.

Author: Nancy Marcus

Copyright 1999-2017 MathMedics, LLC. All rights reserved.
Contact us
Math Medics, LLC. - P.O. Box 12395 - El Paso TX 79913 - USA
users online during the last hour