Log Equations
Change in Base Formula
Properties of Logs
Log Mix Up
Meaning of Logs
100

Solve the equation

log2(6g - 7) = log2(4g - 5)

g=1

100

Use a calculator to approximate to the nearest thousandth

log16(190)

1.892

100

Condense the logarithm

5log3x + log37

log3(7x5)

100

Solve -4 + log2(3x - 1) = 1

11

100

Rewrite in exponential form

log3(1/243) = -5

3-5= (1/243)

200

Solve the equation

log9h + log99 = 2

h=9

200

Use a calculator to approximate to the nearest thousandth

log5(5)

1.000

200

Expand the logarithm

log2 (h/z)

log2 h - log2 z

200

Expand:  log310

Multiple answers possible.

200

Rewrite in exponential form

logd (7/2)= h

dh= 7/2

300

Solve the equation

log96w = log9(9w - 4)

w=(4/3)

300

Use a calculator to approximate to the nearest thousandth

log8400

2.881

300

Condense the logarithm 

log6 3 + log6 8 + log6 6

log6 (3 • 8 • 6)

300

Solve: 2log3x = 4

9

300

Evaluate the expression

log121 11 

1/2

400

Solve the equation

log (3w + 4) = log (2w + 10)

w=6

400

Use a calculator to approximate to the nearest thousandth

log3(46.4)

3.493

400

Expand the logarithm

log5(x5 • m 2 )

5log5 x + 2log5 m

400

Solve:  x5 = 100

2.51

400

Rewrite in logarithmic form

y3= z


logyz=3

500

Solve the equation

log5(6s2 - 192) = log5(24s)

s = -4 or 8

500

Use a calculator to approximate to the nearest thousandth

log 89

1.949

500

Expand the logarithm

log14(7 3• 8)

3log14 7 + log14 8

500

52x = 800

2.08

500

Rewrite in logarithmic form

8(1/8)= S

log8S= (1/8)