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## Calculus-9/21/2011

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**Calculus-9/21/2011**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) • Agenda • Do Now • Laws of Logarithms • Practice • HW: Log Properties Handout • UPCOMING- Test Moved to MONDAY instead of Friday!! 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**• 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 Exponents**Rule 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.**Practice**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 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**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.**Common 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 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**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**• 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 Properties**BASE a: BASE e: 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.**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 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 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 • e2x = 10 • 54x + 1 = 15 • 5 ex + 1 = 30 • ex/5 + 4 = 7 • 32x = 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 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 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 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 1**Apply product property Change into exponential form to solve Simplify Reduce 1 side to zero to solve the quadratic Factor Solutions!! 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**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**Product Property of Logs Switch into exponential form Simplify Get rid of the fraction by multiplying (x-4) Solve for x 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.