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Day 42: November 5th
Objective: Apply strategies for finding inverses to
parent graph equations. Begin to think of the
inverse function for y=3x. THEN Define the term
logarithm as the inverse exponential function or,
when y=bx, “y is the exponent to use with base b to
get x.”
• Homework Check
• 6-54 to 6-58 (pgs 277-279)
• Wells Time
• 6-67 to 6-71 (pgs 281-282)
• Closure
Homework: 6-59 to 6-66 (pgs 279-280) AND 6-72 to
6-80 (pgs 283-284)
Project Due: Monday, November 8th
Silent Board Game
1
2
x 8 32 1 16 4 3 64
  3 5 1 0 4 2
6
1
x 2 0 0.25 1 2 0.2 8
1
  1  2 
3
2
g x
g x
1.6
~ 2.3
g  x   log 2  x 
Silent Board Game
x 1 0 0.2
1 2
1
    3
2 1 0 2
x 2 3 4 8 16 32 64
  1
2 3 4 5 6
1
0.25
2
1
8
~ 2.3
g x
g x
1.6
g  x   log 2  x 
6-71: Closure
log 7  49   2
log 3  81  4
  7
10   1.2
2   w + 3
7
log 5 5
log10
log 2
1.2
w 3
Logarithm's Undo Exponentials
Log’s give you exponents!
y2
Inverses
x
x2
y
Same as
y  log2  x 
Logarithm and Exponential Forms
y = log2(32)
y
2 = 32
Logarithms
This is the general form:
a b
x
log a b  x
a>0
b>0
The logarithm base a of b is the
exponent you put on a to get b.
i.e. Logs give you exponents!