Logarithms

What is a LOGARITHM?

•A logarithm is another way to represent an exponent.

•Video

Drop the

base

Drop the

Drop the

Switch answer and exponent

Try These- Rewrite as Logarithms

• = 81

• = x

• = 128

Log381 = x

Log4x = 5

Logx128 = 7

Can you solve for

x?

Try These- Rewrite as Exponents

•Log5x=2

•Log464=x

•Logx49=2

𝟓𝟐=𝒙

𝟒𝒙=𝟔𝟒

𝒙𝟐=𝟒𝟗

Can you solve for

x?

Can you think of another irrational number that has its own symbol?Can you find e on your calculator?

Pi π ~ 3.14

Try These

• = x• = 5•log 1000 = 3 •ln 7 = x

log x = 4

ln 5 = x

= 1,000

= 7

Assignment

•Handout Circles worksheet.•Look at each exponential and logarithmic equation.•Shade each matching pair the same color or pattern.

•Practice QUIZ

1.23

2.08

2

.442