1. Logarithms

2. What is a LOGARITHM?
A logarithm is another way to represent an exponent.
Video

3. Switch answer and exponent
Drop the
Drop the base
Drop the

4. Try These- Rewrite as Logarithms
Log381 = x
3 𝑥 = 81
4 5 = x
𝑥 7 = 128
Can you solve for x?
Log4x = 5
Logx128 = 7

5. Try These- Rewrite as Exponents
𝟓 𝟐 =𝒙
Log5x=2
Log464=x
Logx49=2
Can you solve for x?
𝟒 𝒙 =𝟔𝟒
𝒙 𝟐 =𝟒𝟗

7. Can you think of another irrational number that has its own symbol?
Can you find e on your calculator?
Pi π ~ 3.14

10. 10 4 = x 𝑒 𝑥 = 5 log 1000 = 3 ln 7 = x log x = 4 ln 5 = x 𝟏𝟎 𝟑 = 1,000
Try These
10 4 = x
𝑒 𝑥 = 5
log 1000 = 3
ln 7 = x
log x = 4
ln 5 = x
𝟏𝟎 𝟑 = 1,000
𝒆 𝒙 = 7

11. Assignment Handout Circles worksheet.
Look at each exponential and logarithmic equation.
Shade each matching pair the same color or pattern.
Practice QUIZ

12. 1.23
2.08

13. 2

14. .442