Rewrite
Calculate
Condense
Expand
Change of Base
100

Rewrite in logarithmic form.

172=289

log17289=2

100

log20

1.301

100

log 7 + log 12

log 84

100

log (5x)

log 5 + log x

100

3x=7

1.771

200

Rewrite in logarithmic form.

34=81

log381=4

200

log 35

1.544

200

log 6 + log 7

log 42

200

log7x5

5log7x

200

5x=39

2.276

300

Rewrite in exponential form.

log5125=3

53=125

300

ln 35

3.555

300

log 2 - log 11

log 2/11

300

log(3/5)

log3 - log5

300

log8 16

1.333

400

Rewrite in exponential form.

log13169=2

132=169

400

e-3

.05

400

log 8 - log 7

log 8/7

400

log2 (9x/y)

log9 + logx - log2 y

400

log7 15

1.392

500

Rewrite in exponential form.

log 1000=3

103=1000

500

e4

54.598

500

log 15 - log 3

log 5

500

log5 (x2/y)

2log5 x -log5 y

500

2x=18

4.17

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