RULES OF LOGARITHMS  Problem 7
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: .
Problem 7: Simplify the following term completely
State the domain that makes your final answer equal to the original expression.
There are many ways to work the above problem; we have included one of the ways.
Solution:

 Step 1: The expression is of the form which can be simplified to the form or

 Step 2: The expression can be simplified to the form or
which can be written as

 Step 3: This last expression is of the form which can be simplified to
or in term of our problem
can be written as

 Step 4: Both of these last terms are in the form which can be simplified to the form
or in terms of our problem
can be written as

 Step 5: These terms can be simplified to
and again to

 Step 6: The first term will work if x > 0, the second term will work if x > 5, the third term will work if x > 8, the fourth term will always work, the fifth term will work if x > 9, and the last term will work if x > 4. If we choose the domain as x > 8, then the original expression
is equal to the final expression

 Step 7: You can check answer by graphing both expression over the domain x >8. If you see just one graph, you have worked the problem correctly.

 Step 8: You can also check the answer by assigning x a value greater than 8 and substituting that value in both expressions. If the answers come out the same, you are correct. Let's let x = 10 in the original equation. If x = 10, the original equation has a value equal to
Let's let x = 10 in the final equation. If x = 10, the final equation has a
value equal to

 Step 9: Pat yourself on the back because you have correctly worked the problem.
If you want to review the menu again, click on menu below.
[Previous 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 © 19992017 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