m3b11: … · 2020. 3. 9. ·...
TRANSCRIPT
M3B11: What are some logarithmic properties we can derive from logarithmic tables?
GROUP 1: Use your calculator to complete the following table. Round the logarithms to four decimal places.
𝒙 𝐥𝐨𝐠 𝒙 𝒙 𝐥𝐨𝐠 𝒙 1 0 10
2 0.3010 12
3 0.4771 16
4 0.6021 18
5 0.6990 20
6 0.7782 25
7 0.8451 30
8 0.9031 36
9 0.9542 100
1. Calculate the following values. Do they appear anywhere else in the table?
a. log 2 + log(4)
b. log 2 + log(6)
c. log 3 + log 4
d. log 6 + log(6)
e. log 2 + log(18)
f. log 3 + log(12) 2. What conjecture can you make when you find the log (x) + log (y)? Example: log(2) + log(4) = log(8) 3. Use your conjecture to find each of the following using your chart. Do not use your calculator to find the logs.
a. log(14) b. log(35) c. log(72) d. log 121
GROUP 2: Use your calculator to complete the following table. Round the logarithms to four
decimal places.
𝒙 𝐥𝐨𝐠 𝒙 𝒙 𝐥𝐨𝐠 𝒙 1 0 10
2 0.3010 12
3 0.4771 16
4 0.6021 18
5 0.6990 20
6 0.7782 25
7 0.8451 30
8 0.9031 36
9 0.9542 100
1. What conjecture can you make when you find the log (x2)? Example: log (42) = log(16) 2. What conjecture can you make when you find the log (x3)? Example: log(23) = log(8) 3. Use your conjecture to find each of the following using your chart. Do not use your calculator to find the logs.
a. log(49) b. log 121 c. log(24)
GROUP 3: Use your calculator to complete the following table. Round the logarithms to four decimal places.
𝒙 𝐥𝐨𝐠 𝒙 𝒙 𝐥𝐨𝐠 𝒙
2 12
4 14
5 15
8 18
10 110
16 116
20 120
50 150
100 1100
1. What pattern(s) can you see in the table above? Write a conjecture using logarithmic notation.
Log !! = __________________________
2. Now, test your conjectures by using your tables to determine the following values:
a. log 0.00049 b. log1640