12
log 16 ൌ ? log 16 ൌ 4 ?ൌ4 16 ൌ 2 ? 2 2 ?ൌ4 Exponential Form log 16 ൌ 16 ൌ 2 2 2 ൌ4 Set Log arbitrarily Exponential Form Change of Base Same Base: Make exponents equal to each other Log Form ‐> Exponential Form and Solve for ℎ ℎ ′′ ℎ . ℎ / log 9 ൌ ? log 9ൌ2 ?ൌ2 Think: What power do you have to raise 3 to, to equal 9? log 8 ൌ ? log 8ൌ3 ?ൌ3 Switching from Log Form to Exponential Form: Remember: The base of the log is the base of the exponent. The exponent is the Answer. The thing you are Logging equals the Base to the other side. The Definition of a Logarithm: Log Form 8 equals 2 to what power? 16 equals 2 to what power? log 16 ൌ 4 log 1 27 ቇൌ 1 27 3 1 3 3 3 3 ൌ െ3 log 16 ൌ 16 ൌ ቆ 1 2 2 2 2 2 4 ൌ െ ൌ െ4 log 16 16 222ൌ4 Exponential Form Change of Base Exponent Laws Solve Exponential Form Change of Base Exponent Laws Exponential Form Change of Base C12 ‐ 8.1 ‐ log ? Definition Notes Log Page 1

C12 ‐8.1 ‐ log Õ 𝑎? Definition Notesknackacademics.com/files/Math/Pre-Calculus 12/pc12-chapter7_8-notes... · log :𝑥2 𝑥 L6 6 𝑥 L36 The base of the log is the base

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log 16 ?log 16 4

? 4

16 2?

2 2

? 4

Exponential Form

log 16 𝑥

16 2 2 2

𝑥 4

Set Log arbitrarily  𝑥

Exponential FormChange of Base

Same Base: Make exponents equal to each other

Log Form ‐> Exponential Form and Solve for 𝑥

′𝑎 𝑖𝑠 𝑡ℎ𝑒 𝑡ℎ𝑖𝑛𝑔 𝑦𝑜𝑢 𝑎𝑟𝑒 𝑙𝑜𝑔𝑔𝑖𝑛𝑔

′𝑏′ 𝑖𝑠 𝑡ℎ𝑒 𝑏𝑎𝑠𝑒.

′𝑐 𝑖𝑠 𝑡ℎ𝑒 𝑎𝑛𝑠𝑤𝑒𝑟/𝑒𝑥𝑝𝑜𝑛𝑒𝑛𝑡

𝐿𝑜𝑔 𝐹𝑜𝑟𝑚

𝐸𝑥𝑝𝑜𝑛𝑒𝑛𝑡𝑖𝑎𝑙 𝐹𝑜𝑟𝑚

log 9 ?log 9 2

? 2

Think: What power do you have to raise 3 to, to equal 9?

log 8 ?log 8 3

? 3

Switching from Log Form to Exponential Form:

Remember: The base of the log is the base of the exponent.

The exponent is the Answer.The thing you are Logging equals the Base to the other side.

The Definition of a Logarithm:

Log Form

8 equals 2 to what power?

16 equals 2 to what power?

log 16 4

log1

27⎯⎯⎯ 𝑥

1

27⎯⎯⎯ 3

1

3⎯⎯ 3

3 3

𝑥 3

log⎯⎯

16 𝑥

1612⎯⎯

2 2 2 2 4 𝑥 𝑥 4

log 16𝑎 𝑥 16𝑎 2𝑎 2𝑎 2𝑎

𝑥 4

Exponential FormChange of BaseExponent LawsSolve

Exponential Form

Change of BaseExponent Laws

Exponential FormChange of Base

C12 ‐ 8.1 ‐ log 𝑎 ? Definition Notes

Log Page 1

log 𝑥 2 𝑥 6

𝑥 36

The base of the log is the base of the exponent

log 𝑥 2 𝑥 5

𝑥1

5⎯⎯

𝑥1

25⎯⎯⎯

log 𝑥 5 2 𝑥 5 2 𝑥 4 5

𝑥 9

𝑙𝑜𝑔 2 1 2 𝑥 3 2 𝑥 3 𝑥 5

log 64 3 64 𝑥 4 𝑥

𝑥 4

log 2732⎯⎯

27 𝑥⎯⎯

27⎯⎯ 𝑥⎯⎯⎯⎯

27⎯⎯ 𝑥

27⎯⎯⎯

𝑥

𝑥 9

log 125 𝑥 125 5 5 5 𝑥 3

Exponential FormChange of Base

Same Base: Make exponents equal to each other

log 𝑥 3 𝑥 4

𝑥 64

log 32 5 32 𝑥 2 𝑥

2⎯⎯

𝑥⎯⎯⎯

𝑥 5

Exponential Form

Solve

Exponential FormChange of BaseFifth Root Both Sides

Solve

Log Form ‐> Exponential Form and Solve for 𝑥

Exponent Laws

Solve

log 𝑥12⎯⎯

𝑥 9⎯⎯

𝑥 √9⎯⎯

𝑥 3

Exponential FormChange of Base

Solve

Take both/sides to reciprocal exponent

log 16 𝑥 2 16 2 2 2 4 𝑥 2

𝑥 2

log 16 𝑥 2log 16 2 𝑥 4 2 𝑥

𝑥 2

log 16 𝑥 16 2 2 2 𝑥 4

log 16 4OR Do AlgebraFirst!

C12 ‐ 8.1 ‐ log 𝑥 𝑐, log 𝑎 𝑐, log 𝑎 𝑥 𝑁𝑜𝑡𝑒𝑠

Log Page 2

log # 𝑢𝑛𝑑log # 𝑢𝑛𝑑𝑙𝑜𝑔 0 𝑢𝑛𝑑

𝑙𝑜𝑔 3 𝑢𝑛𝑑

log 5𝑥 𝑥12⎯⎯

5𝑥 𝑥 36⎯⎯

5𝑥 𝑥 6 𝑥 5𝑥 6 0 𝑥 2 𝑥 3 0

𝑥 2 , 𝑥 3

5𝑥 𝑥 0𝑥 5 𝑥 0

0 𝑥 5

log 𝑥 112⎯⎯

𝑥 1 9⎯⎯

𝑥 1 3 𝑥 4 0 𝑥 2 𝑥 2 0

𝑥 2 , 𝑥 2

𝑥 1 0𝑥 1 𝑥 1 0

𝑥 1 , 𝑥 1

log 𝑥 2 𝑥 3 𝑥 9

𝑥⎯⎯⎯

√9⎯⎯

𝑥 3

𝑥 3 , 𝑥 3

2 log 𝑥 2 log 𝑥 1 𝑥 1 𝑥 9

𝑥⎯⎯⎯

√9⎯⎯

𝑥 3

𝑥 3 , 𝑥 3

𝑥 0 𝑥 0𝑥 0, 𝑥 0

𝑥 0

log 3 𝑥 3 3 𝑥 2 3 𝑥 8

𝑥 5

3 𝑥 0 𝑥 3

𝑥 3

𝑙𝑜𝑔 2 2 2 𝑥 3 2 𝑥 3 𝑥 3 2 𝑥 6𝑥 9 0 𝑥 6𝑥 7 0 𝑥 7 𝑥 1

𝑥 7 , 𝑥 1

𝑥 3 0

𝑥 3

log # 𝑢𝑛𝑑

𝑙𝑜𝑔𝑥

𝑥 0

log #

𝑥 0 , 𝑥 1

log 𝑥 5 2 𝑥 5 2 𝑥 4 5

𝑥 9

log 𝑥 2 𝑥 2

𝑥 4

State Restrictions and Solve

State Restrictions

𝑥 0 𝑥 5 0

𝑥 5

Domain: Set the thing you are logging to greater than or equal to zero, then solve.

𝑥 3 1

𝑥 4

Set the base of the log  0 𝑎𝑛𝑑 1 𝑎𝑛𝑑 𝑠𝑜𝑙𝑣𝑒.

C12 ‐ 8.2 ‐ Log Restrictions Notes

Log Page 3

log 5 𝑥 5 5

𝑥 4

Change of BaseBring Exponent down in frontLog Rules

Solve

log 5 1

𝑙𝑜𝑔 625 𝑥 log 5 𝑥 4log 5 𝑥 4 1 𝑥

𝑥 4

5 to what power is 5

Bring Exponent down in front and Vice Versa

3𝑙𝑜𝑔42 3𝑙𝑜𝑔4 6𝑙𝑜𝑔4

𝑙𝑜𝑔52𝑙𝑜𝑔5

𝑙𝑜𝑔𝑥2𝑙𝑜𝑔𝑥 3𝑙𝑜𝑔4

𝑙𝑜𝑔4𝑙𝑜𝑔4

OR

𝑙𝑜𝑔√𝑥⎯⎯

𝑙𝑜𝑔𝑥⎯⎯

12⎯⎯log 𝑥

𝑙𝑜𝑔𝑥

2⎯⎯⎯⎯

log12⎯⎯

𝑙𝑜𝑔21𝑙𝑜𝑔2

𝑙𝑜𝑔2

𝑙𝑜𝑔 625 𝑥 625 5 5 5

𝑥 4

C12 ‐ 8.3 ‐ log 𝑎 𝑚𝑙𝑜𝑔𝑎 Notes

Log Page 4

log 16𝑙𝑜𝑔 4

⎯⎯⎯⎯⎯⎯

log 16 2 Change of Base

log 27𝑙𝑜𝑔27𝑙𝑜𝑔3

⎯⎯⎯⎯⎯

𝑙𝑜𝑔3𝑙𝑜𝑔3

⎯⎯⎯⎯⎯

3𝑙𝑜𝑔3𝑙𝑜𝑔3

⎯⎯⎯⎯⎯ 3

1

log 2⎯⎯⎯⎯⎯

1

𝑙𝑜𝑔2𝑙𝑜𝑔8⎯⎯⎯⎯

⎯⎯⎯⎯⎯⎯

1𝑙𝑜𝑔8𝑙𝑜𝑔2⎯⎯⎯⎯

𝑙𝑜𝑔8𝑙𝑜𝑔2⎯⎯⎯⎯

log 8 3

log 16log 16log 8

⎯⎯⎯⎯⎯⎯43⎯⎯

Change of Base

Change of Base

Change of Base

27 3

Exponential Form

16 4

16 28 2

8 2

Change of Base

log 4log 4log 2⎯⎯⎯⎯⎯

21⎯⎯ 2

4 2

2 2

Exponent down in front

𝑙𝑜𝑔16𝑙𝑜𝑔2

⎯⎯⎯⎯⎯

log 16 416 2

Change of Base

Choose the Base you want! Think about it.

C12 ‐ 8.3 ‐ Change of Base Notes

Log Page 5

log 4 log 8 log 4 8 log 32 5

32 2

Exponential FormAdd‐Multiply

log 3 log 9 𝑙𝑜𝑔 3 9 log 27 3 Add‐Multiply

27 31 2 3

2 3 5

log 27 log 3 log273

⎯⎯⎯ log 9 2

3 1 2

Subtract‐Divide

𝑙𝑜𝑔64 𝑙𝑜𝑔4 16 𝑙𝑜𝑔 4 𝑙𝑜𝑔16 Separate into an addition of logs

𝑙𝑜𝑔5 log102

⎯⎯⎯ 𝑙𝑜𝑔10 𝑙𝑜𝑔2Separate into a subtraction of logs

𝑙𝑜𝑔1 𝑙𝑜𝑔5 𝑙𝑜𝑔7 𝑙𝑜𝑔1 5 7 log 35 Add‐Multiply

𝑙𝑜𝑔5 𝑙𝑜𝑔2 𝑙𝑜𝑔10 𝑙𝑜𝑔5

2 10⎯⎯⎯⎯⎯⎯ log

14⎯⎯

𝑙𝑜𝑔5 𝑙𝑜𝑔2 𝑙𝑜𝑔10 𝑙𝑜𝑔5 10

2⎯⎯⎯⎯⎯⎯ 𝑙𝑜𝑔25

𝑙𝑜𝑔4 𝑙𝑜𝑔20 𝑙𝑜𝑔10 𝑙𝑜𝑔4 20

10⎯⎯⎯⎯⎯⎯ 𝑙𝑜𝑔 8 Positives on top, Negatives on Bottom

C12 ‐ 8.4 ‐ log 𝑚 log 𝑛 log 𝑚𝑛 𝑙𝑜𝑔 𝑚 𝑙𝑜𝑔 𝑛 𝑙𝑜𝑔 ⎯⎯

Log Page 6

Add‐Multiply

Subtract‐Divide‐Factor‐Simplify

log 3 log 𝑥 1 𝑙𝑜𝑔3 𝑥 1 log 3𝑥 3

log 𝑥 2 log 𝑥 1 log 𝑥 2 𝑥 1 log 𝑥 𝑥 2 Add‐Multiply

log 𝑥 1 log 𝑥 1 log𝑥 1 𝑥 1

⎯⎯⎯⎯⎯⎯ log𝑥 1 𝑥 1

𝑥 1⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ log 𝑥 1

𝑙𝑜𝑔𝑥 log 𝑥 log 𝑥 𝑥 log 𝑥Add‐Multiply

log 𝑥 log 𝑥 log𝑥𝑥⎯⎯⎯ 𝑙𝑜𝑔𝑥

Subtract‐Divide‐Simplify

C12 ‐ 8.4 ‐ log 𝑚 log 𝑛 log 𝑚𝑛 𝑙𝑜𝑔 𝑚 𝑙𝑜𝑔 𝑛 𝑙𝑜𝑔 ⎯⎯

Log Page 7

𝑙𝑜𝑔5 𝑙𝑜𝑔2 𝑙𝑜𝑔5 log 2 0.2104

𝑙𝑜𝑔62𝑙𝑜𝑔6 1.5563 Bring your exponent down in front.

𝑙𝑜𝑔5 𝑥 2 𝑙𝑜𝑔5 𝑥𝑙𝑜𝑔5 2𝑙𝑜𝑔5

𝑙𝑜𝑔𝑥𝑦𝑙𝑜𝑔𝑥 𝑙𝑜𝑔𝑦𝑙𝑜𝑔𝑥 2𝑙𝑜𝑔𝑦

𝑙𝑜𝑔𝑥 𝑦𝑙𝑜𝑔𝑥 𝑙𝑜𝑔𝑦2𝑙𝑜𝑔𝑥 2𝑙𝑜𝑔𝑦

log 𝑥𝑦2𝑙𝑜𝑔𝑥𝑦2 𝑙𝑜𝑔𝑥 𝑙𝑜𝑔𝑦2𝑙𝑜𝑔𝑥 2𝑙𝑜𝑔𝑦

The exponent only applies to the y value

You can bring this exponent down in front.Remember: If you separate into an addition you must distribute the 2.

3𝑥𝑙𝑜𝑔7 𝑥𝑙𝑜𝑔2𝑥 3𝑙𝑜𝑔7 𝑙𝑜𝑔2 𝐺𝐶𝐹 𝑥

𝐷𝑖𝑠𝑡𝑟𝑖𝑏𝑢𝑡𝑒

𝑙𝑜𝑔25 1.3979𝑙𝑜𝑔5 1.39792𝑙𝑜𝑔5 1.3979

25 5Change of Base If for example you know:

𝑙𝑜𝑔5 𝑎 2𝑙𝑜𝑔52𝑎

𝑙𝑜𝑔𝑥 𝑙𝑜𝑔𝑥 𝑙𝑜𝑔𝑥 𝑙𝑜𝑔𝑥

𝑙𝑜𝑔2𝑥𝑙𝑜𝑔𝑥

⎯⎯⎯⎯⎯𝑙𝑜𝑔2𝑥𝑙𝑜𝑔𝑥

⎯⎯⎯⎯⎯

𝑙𝑜𝑔𝑥 𝑙𝑜𝑔𝑥 𝑙𝑜𝑔𝑥 Cannot bring exponent down in front

Cannot Divide 2 logs

Cannot multiply 2 logs

2𝑙𝑜𝑔5 2𝑙𝑜𝑔5 Cannot distribute into a log

log 𝑥 2 log 𝑥 2 Cannot distribute

𝑙𝑜𝑔8 0.9031 Calculator𝑙𝑜𝑔 7 1.4037 Math, Alpha, Math

2𝑙𝑜𝑔53 2𝑙𝑜𝑔5 6𝑙𝑜𝑔5 4.1938

If there is a number in front multiply

C12 ‐ 8.5 ‐ Log Operation Notes

Log Page 8

log 8 log 8 log 64 38 2 64 4

Exponential Form

Take the base and the log to any exponent you like!

log⎯⎯

4 log⎯⎯

4 log 4 1 log 4 214⎯⎯ 2

12⎯⎯ 2

log 4 24 2

Bring your exponent down in front

1 2 2

𝑇𝑎𝑘𝑒 𝑡ℎ𝑒 𝑏𝑎𝑠𝑒 𝑎𝑛𝑑 𝑡ℎ𝑒 𝑡ℎ𝑖𝑛𝑔 𝑦𝑜𝑢 𝑎𝑟𝑒 𝑙𝑜𝑔𝑔𝑖𝑛𝑔 𝑡𝑜 𝑎𝑛 𝑒𝑥𝑝𝑜𝑛𝑒𝑛𝑡 𝑡𝑜 𝑔𝑒𝑡 𝑙𝑖𝑘𝑒 𝑏𝑎𝑠𝑒𝑠 𝑡𝑜 𝑢𝑠𝑒 log 𝑙𝑎𝑤𝑠

C12 ‐ 8.5 ‐ Operation log 𝑎 𝑁𝑜𝑡𝑒𝑠

Log Page 9

4 2 𝑙𝑜𝑔4 𝑙𝑜𝑔2 𝑙𝑜𝑔4 𝑥𝑙𝑜𝑔2

𝑙𝑜𝑔4𝑙𝑜𝑔2⎯⎯⎯⎯ 𝑥

log 4 𝑥 4 2 2 2 𝑥 2

Log Both SidesBring Exponents Down In FrontDivide

Change of baseExponential FormChange of baseSolve

8 2 2 4 2

3 2 14 2

Divide FirstAdd/Subtract First

De‐log Both sides

log 4 log 𝑥 4 𝑥

3 5 𝑙𝑜𝑔3 𝑙𝑜𝑔5 𝑙𝑜𝑔3 𝑥𝑙𝑜𝑔5

𝑙𝑜𝑔3𝑙𝑜𝑔5⎯⎯⎯⎯ 𝑥

log 3 𝑥 𝑥 0.6826

Remember: You may only log both sides if SAMD is complete. Bedmas backwards.Remember: If you do log a product you must separate into an addition of logs.Remember: if you log a sum you must use bracketsRemember: You may only de‐log both sides if one log equals one log.

𝐴𝑙𝑔𝑒𝑏𝑟𝑎𝑖𝑐 𝑎𝑛𝑠𝑤𝑒𝑟

4 7 𝑙𝑜𝑔4 𝑙𝑜𝑔7 𝑙𝑜𝑔4 𝑥 1 𝑙𝑜𝑔7 𝑙𝑜𝑔4 𝑥𝑙𝑜𝑔7 log 7𝑙𝑜𝑔4 𝑙𝑜𝑔7 𝑥𝑙𝑜𝑔7𝑙𝑜𝑔4 𝑙𝑜𝑔7

𝑙𝑜𝑔7⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ 𝑥

𝑥𝑙𝑜𝑔4 𝑙𝑜𝑔7

𝑙𝑜𝑔7⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯

𝑥 0.29

Check Answer: 

5 . 3

2 9 𝑙𝑜𝑔2 𝑙𝑜𝑔9 2𝑥 5 𝑙𝑜𝑔2 𝑥 2 𝑙𝑜𝑔9 2𝑥𝑙𝑜𝑔2 5𝑙𝑜𝑔2 𝑥𝑙𝑜𝑔9 2𝑙𝑜𝑔9 2𝑥𝑙𝑜𝑔2 𝑥𝑙𝑜𝑔9 2𝑙𝑜𝑔9 5𝑙𝑜𝑔2𝑥 2𝑙𝑜𝑔2 𝑙𝑜𝑔9 2𝑙𝑜𝑔9 5𝑙𝑜𝑔2

𝑥2𝑙𝑜𝑔9 5𝑙𝑜𝑔22𝑙𝑜𝑔2 𝑙𝑜𝑔9

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯

DistributeCombine x's on one sideEverything else on other sideFactor out xDivide

𝐺𝐶𝐹 𝑥Divide

Before you log both sides!

8 3 𝑙𝑜𝑔8 𝑙𝑜𝑔3 𝑙𝑜𝑔8 2𝑥𝑙𝑜𝑔3

𝑙𝑜𝑔8𝑙𝑜𝑔3⎯⎯⎯⎯ 2𝑥

log 8

2⎯⎯⎯⎯⎯ 𝑥

12⎯⎯log 8 𝑥

x log 8⎯⎯

Bring Fraction In Front.Bring Coefficient Up 

Or

8 2 2𝑙𝑜𝑔8 log 2 2𝑙𝑜𝑔8 𝑙𝑜𝑔2 𝑙𝑜𝑔2

Or divide log7 and minus 1

6 3 14 𝑙𝑜𝑔6 3 𝑙𝑜𝑔14 𝑙𝑜𝑔6 𝑙𝑜𝑔3 𝑙𝑜𝑔14 𝑙𝑜𝑔6 𝑥𝑙𝑜𝑔3 2𝑥 5 𝑙𝑜𝑔14 𝑙𝑜𝑔6 𝑥𝑙𝑜𝑔3 2𝑥𝑙𝑜𝑔14 5𝑙𝑜𝑔142𝑥𝑙𝑜𝑔14 𝑥𝑙𝑜𝑔3 𝑙𝑜𝑔6 5𝑙𝑜𝑔14𝑥 2𝑙𝑜𝑔14 𝑙𝑜𝑔3 𝑙𝑜𝑔6 5𝑙𝑜𝑔14

𝑥𝑙𝑜𝑔6 𝑙𝑜𝑔15

2𝑙𝑜𝑔14 𝑙𝑜𝑔3⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯

𝑅𝑢𝑙𝑒 6 𝑃𝑟𝑜𝑜𝑓 𝑎 𝑥 log a 𝑙𝑜𝑔𝑥log 𝑥 log 𝑎 𝑙𝑜𝑔𝑥log 𝑥 log 𝑎

𝑙𝑜𝑔𝑎⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯

𝑙𝑜𝑔𝑥log 𝑎⎯⎯⎯⎯

log 𝑥𝑙𝑜𝑔𝑥𝑙𝑜𝑔𝑎⎯⎯⎯⎯

log 𝑥 log 𝑥 𝑥 𝑥

C12 ‐ 8.6 ‐ Log/Delog Both Sides Notes

Log Page 10

𝑦 log 𝑥

𝑦 2

𝑥 𝑦

𝑥 𝑦

1 12⎯⎯

0 1

1 2

𝑥 𝑦

12⎯⎯

1

1 0

2 1

𝐺𝑟𝑎𝑝ℎ:

𝑦 log 𝑥

𝑦 2

𝑦 log 𝑥 2 1 𝐺𝑟𝑎𝑝ℎ:

𝑦 2

𝑦 2

𝑥 𝑦

𝑦 log 𝑥

𝑦 log 𝑥 2 1

𝐿𝑒𝑓𝑡 2𝑈𝑝 1

𝐷𝑜𝑚𝑎𝑖𝑛: 𝑥 0

𝑥 2 0 𝑥 2

𝑉𝐴: 𝑥 0

𝑥 2 0 𝑥 2

C12 ‐ 8.7 ‐ Graph Log Notes

Log Page 11

𝑦 2

1,12⎯⎯

0,11,2

2,4

12⎯⎯, 1

1,02,1

4,2

y log 𝑥

Remember: Inverse: Switch x and y Remember: A diagonal reflection over the line 𝑦 𝑥

𝑦 2 𝑥 2 𝑙𝑜𝑔𝑥 𝑙𝑜𝑔2 𝑙𝑜𝑔𝑥 𝑦𝑙𝑜𝑔2

𝑙𝑜𝑔𝑥𝑙𝑜𝑔2⎯⎯⎯⎯ 𝑦

log 𝑥 𝑦 𝑦 log 𝑥𝑓 𝑥 log 𝑥

y log 𝑥 𝑥 log 𝑦 2 𝑦 𝑦 2𝑓 𝑥 2

𝑦 2 𝑥 2 𝑦 log 𝑥𝑓 𝑥 log 𝑥

𝑥 𝑦

0 𝑢𝑛𝑑

12⎯⎯

1

1 0

2 1

2 4

𝑥 𝑦

1 12⎯⎯

0 1

1 2

2 4

𝑆𝑤𝑖𝑡𝑐ℎ 𝑥 𝑎𝑛𝑑 𝑦Log Both SidesBring Exponents Down In FrontDivide

Change of baseMirrorInverse Function notation

𝑆𝑤𝑖𝑡𝑐ℎ 𝑥 𝑎𝑛𝑑 𝑦Exponential to 𝑙𝑜𝑔 Form

𝐵𝑎𝑐𝑘 𝑡ℎ𝑒 𝑂𝑡ℎ𝑒𝑟 𝑊𝑎𝑦!

𝑦 2 3 𝑥 2 3 𝑥 3 2 log 𝑥 3 𝑦 1 𝑙𝑜𝑔2

log 𝑥 3

𝑙𝑜𝑔2⎯⎯⎯⎯⎯⎯⎯⎯⎯ 𝑦 1

log 𝑥 3 𝑦 1log 𝑥 3 1 𝑦 𝑦 log 𝑥 3 1 𝑓 𝑥 log 𝑥 3

𝑦 log 𝑥 3 1 𝑥 log 𝑦 3 1 𝑥 1 log 𝑦 3 2 𝑦 32 3 𝑦 𝑦 2 3 𝑓 𝑥 2 3

𝐼𝑛𝑣𝑒𝑟𝑠𝑒 𝑃𝑟𝑜𝑜𝑓

C12 ‐ 8.7 ‐ Inverse Log Graphs Notes

Log Page 12