Calculus-9/21/2011 Objectives: Solve complex algebraic problems using laws of logs and exponents. Use the definition of log and exponent to switch between.

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Presentation transcript:

Calculus-9/21/2011 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. Agenda Do Now Laws of Logarithms Practice HW: Log Properties Handout UPCOMING- Test Moved to MONDAY instead of Friday!! Take Out: Do Now Sheet, Pencil, Homework DO NOW: Exponent laws handout Do these on answers out on your green sheet under Wednesday (because guess what it is Wednesday)

Exponents, LogsExponents, 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  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.

Rules for ExponentsRules for Exponents 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.

Practice

More Exponent RulesMore Exponent Rules 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.

Practice

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

Root – Exponent ConnectionRoot – Exponent Connection 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.

Practice

Logs  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. 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.

Logs  Basic Definition of a log: 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.

More Log Rules-Inverse PropertiesMore Log Rules-Inverse Properties 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. BASE a : BASE e :

How can we use this in an algebraic context?  Whenever the variable you are looking for is in the exponent, we need to use 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.

Example 2-using inverse propertyExample 2-using inverse property 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.

Example 3- Using Change of Base RuleExample 3- Using Change of Base Rule 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.

Practice-Now you try either use change of base or inverse property to solve for x 1) e 2x = 10 2) 5 4x + 1 = 15 3) 5 e x + 1 = 30 4) e x/5 + 4 = 7 5) 3 2x = 40 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.

Rules of LogarithmsRules of Logarithms  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 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 Logarithms b m × b n = b m+n log b xy = log b x + log b y b m ÷ b n = b m-n log b (x/y) = log b x − log b y (b m ) n = b mn log b (x n ) = n log b x b 1 = b log b (b) = 1 b 0 = 1 log b (1) = 0

Example 1Example 1 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. Apply product property Change into exponential form to solve Simplify Reduce 1 side to zero to solve the quadratic Factor Solutions!!

Example 2Example 2 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.

Example 3Example 3 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. Product Property of Logs Switch into exponential form Simplify Get rid of the fraction by multiplying (x-4) Solve for x