Bell ringer 2-13-18 The Johnson’s started a savings account for their son. They invested $5,000 in an account with a 7.5% interest rate that compounds.

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Presentation transcript:

Bell ringer 2-13-18 The Johnson’s started a savings account for their son. They invested $5,000 in an account with a 7.5% interest rate that compounds quarterly. How much will they have in the account after 20 years? How much interest will they have earned?

Logarithms Tuesday, February 13, 2018

Graphs Exponential Logarithmic

Inverse

Notes The inverse of an exponential function is a common logarithmic function. Convert from exp. to log  bx = y  logb y = x Convert from log to exp.  logb y = x  bx = y

convert

NOTES Calculators only do log10 aka “common log”, so log is really log base 10. Change of Base  logba = log a logb logb1 = 0 Can’t take  log 0 or log of a negative # Can’t do  log base 0, or 1, or negative #

Change that base

practice Change Base & Convert Classwork Change Base & Convert Homework

Exit Ticket 1. How do you “convert”? 2. How do you “Change Base”? 3. What is the base if it doesn’t say?