Warm-Up April 14 th
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Transcript of Warm-Up April 14 th
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HW Check HW 6.5 1. a. 12,000 bacteria
b. 96,000 bacteriac. 768,000 bacteria
2. 0.5 g3. a. 6,800 insects
b. 425 insects4. 15 hours5. 72 billion6. a. 37,402,600 bact.
b. 6,553,790 bact.
7. 2,609,610 people8. a. 28.6 million
b. 29.1 million9. a. 689 bacteria
b. 2986 bacteria10.a. 172,800 termites
b. 371,806 termitesc. 627 termites
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NATURAL LOGARITHMS
6.6a
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The Constant: ee is a constant very similar to π.Π = 3.141592654…e = 2.718281828…Because it is a fixed number we can find e2
e3
e4
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Exponential Functions with e
Exponential Functions with a base of e are used to describe CONTINUOUS growth or decay.
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Natural LogarithmicWe call a log with a base of 10 “Common Log”We can call a log with a base of e “Natural Log”
Natural Log is denoted with the “LN”All the same rules and properties apply to natural log as they do to regular logs
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Natural Logs
Natural logs have a base of e.
loge5 Ln5
But instead of writing loge5, we change it to ln5
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Natural Logs
A natural logarithm is defined as follows:
If y = ex, then Lny = x
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Exponential to Log form1. ex = 6
2. ex = 25
3. ex + 5 = 32
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Log to Exponential Form 1. Ln 1 = 0
2. Ln 9 = 2.197
3. Ln (5.28) = 1.6639
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Solving Exponential Equations1. ex = 18
2. ex+1 = 30
3. e2x = 12
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Solving Logarithmic Equations 4. Ln x = -2
5. Ln (2m + 3) = 8
6. 1.1 + Ln x2 = 6
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PROPERTIES OF LOGARITHMS
6.6b
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You’ve gotten good at solving exponential equations with logs…
… but how would you handle something like this?
733 4log2log x
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Properties of Logarithms
1. Product Property2. Quotient Property3. Power Property
The log bases must be the same in order to apply these properties!
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Product Property
NMMN bbb logloglog
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Quotient Property
NMNM
bbb logloglog
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Power Property
MxM bx
b loglog
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Steps for Condensing
Step 1: Put everything in the sky (create exponents).
Step 2: Combine.
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Example 1: Condense the following logarithmic expression.
4log20log 33
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Example 2: Condense the following logarithmic expression.
yx 22 loglog3
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Example 3: Condense the following logarithmic expressions.
16log4log2log3
9log9log3 62
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Simplify4. 3 Ln 5
5. Ln 5 + Ln 4
6. Ln 20 – Ln 10
7. 4 Ln x + Ln y – 2 Ln z
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Steps for Expanding
Step 1: Separate the combinations.
Step 2: Get everything out of the sky. (move the exponents)
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Example 4: Expand the following logarithmic expression.
yx
5log
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Example 5: Expand the following logarithmic expression.
43log r
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Example 6: Expand the following logarithmic expressions.
2
3log
y
437log ba
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Expand7. Ln (xy2)
8. Ln(x/4)
9. Ln(y/2x)
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Quick Recap!
To combine:
1. Put everything in the sky.
2. Combine.
To expand:
1. Separate the combinations.
2. Get everything out the sky.