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Calculus-9/23/2010

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Take Out: Do Now Sheet, Pencil, Homework

DO NOW:

Evaluate using laws of exponents

1)

2)

Agenda:

-Do Now

-HW Questions

-Logs and Exponents powerpoint

HW: Logs and Exponents Handout

Objectives: Solve complex algebraic problems using laws of logs and exponents.

Use the definition of log and exponent to switch between log and exponent form in an algebraic equation.

Exponents, Logs

Objectives: Solve complex algebraic problems using laws of logs and exponents. Use the definition of log and exponent to switch between log and exponent form in an algebraic equation.

- Exponents are repeated multiplication:
n times

- Example:

Objectives: Solve complex algebraic problems using laws of logs and exponents. Use the definition of log and exponent to switch between log and exponent form in an algebraic equation.

RuleExample

Objectives: Solve complex algebraic problems using laws of logs and exponents. Use the definition of log and exponent to switch between log and exponent form in an algebraic equation.

- Roots don’t count as a separate category, because they are just like exponents. We’ll see why in a second.

- I want you to be able to use logs to solve for a variable.
Things to Remember…

If you have an exponential equation with a # base use logs to solve.

If you have an exponential equation with base e use natural log (ln) to solve.

- Basic Definition of a log:

BASE a:

BASE e:

- Whenever the variable you are looking for is in the exponent, we need to use logs

- e2x = 10
- 54x + 1 = 15
- 5 ex + 1 = 30
- ex/5 + 4 = 7
- 32x = 40

- Since a logarithm is simply an exponent which is just being written down on the line, we expect the logarithm laws to work the same as the rules for exponents, and luckily, they do

ExponentsLogarithms

bm × bn = bm+nlogbxy = logbx + logby

bm ÷ bn = bm-nlogb (x/y) = logbx − logby

(bm)n = bmnlogb (xn) = nlogbx

b1 = blogb (b) = 1

b0 = 1 logb (1) = 0

Apply product property

Change into exponential form to solve

Simplify

Reduce 1 side to zero to solve the quadratic

Factor

Solutions!!

Product Property of Logs

Switch into exponential form

Simplify

Get rid of the fraction by multiplying (x-4)

Solve for x