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Exam Strategy

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Pre-calculus · AP · Exponential and Logarithmic Functions

CED focus

Competing Function Model Validation

This topic is assessed on the AP Exam.

Multiple-choice tips

  • Identify growth vs decay from the base before computing.
  • Eliminate choices that mix up log and exponential forms.
  • Check whether the prompt wants an exact log form or a decimal.
  • Watch for domain errors on log arguments in MC distractors.

Free-response tips

  • Rewrite between exponential and log form when the FRQ asks for justification.
  • Show parameter meaning (initial value, growth factor) in context.
  • Use inverse reasoning to check a log/exponential solution.
  • Include units on contextual parameters and answers.

Common traps

  • Applying log rules to an expression that is not a single log
  • Ignoring whether the base is greater than 1 or between 0 and 1
  • Rounding too early on growth/decay parameters

Quick checklist

  • [ ] Can translate between exponential and log form
  • [ ] Can identify growth/decay from a base or rate
  • [ ] Can interpret parameters in a short context sentence

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