M1.+Compute+Logarithms

10^x=a
(log * a=x)

Your calculator is a very helpful tool when computing logarithms.



In order to figure out your equation using logs, press the log button on your calculator. Then the parentheses button, type in the answer to the original equation, and press answer. The answer you now get, is the exponent in your original equation.

**2. Example Problems.**
If 10^x=10000, then we have to find the exponent, //x.//

log(10000)=4

If 10^x=1985

log(1985)=3.297760511

3. Common mistakes or misunderstandings.
People usually get confused with the equation and mix around the variables.

(log * a=x)
People sometimes think the equation looks like this, which they think the the exponent is actually //variable a//, when //variable a// is the outcome of the equation, the answer, and //variable x// is the exponent.

10^a=x (log * x=a)

That is NOT correct. Do not do this way.

4. For more information.

 * Some helpful information:**

http://www.purplemath.com/modules/logs.htm
 * Website:**

http://oakroadsystems.com/math/loglaws.htm

Unit 5 in your book, and Pages 373-383.
 * Book:**