Exponential Rules from Tables

Build tables of values and identify patterns for exponential rules y = a·b^x + c, reading off the common ratio, growth or decay, y-intercept, and horizontal asymptote, and deriving the rule from a table or from given starting/growth information.

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Te reo Māori terms

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Learning objective overview

Master Teaching Guide coverage for this objective.

Current NZC (2007)
  • NA6-7
New NZC (2026)
  • NZC26-P4-ALG-ER-P-Y10-09

Resources

Terminology

  • geometric sequence
  • common ratio
  • multiplier
  • growth
  • decay
  • table of values
  • y-intercept
  • horizontal asymptote

Task goals

  • Continue a geometric (exponential) sequence and identify its multiplier (common ratio).
  • Distinguish exponential sequences from linear or quadratic sequences by testing for a common ratio versus a common difference.
  • Complete a table of values for y = b^x and for transformed forms y = a·b^x + c.
  • Identify growth (ratio greater than 1) or decay (ratio between 0 and 1) from a table of values or an equation.
  • Read the y-intercept and horizontal asymptote directly from an exponential equation, and use them together with growth/decay to describe or compare graphs.
  • Derive an exponential rule a·b^x + c from a table of values or from a described starting value and growth/decay factor.
  • Solve for an unknown coefficient a in a rule y = a·b^x + c given one point the graph passes through.

Where this fits

What leads into this objective, and where it goes next.

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Exponential Rules from Tables

Exponential Rules from Tables

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