Mathematics (2019) Grade(s): 09-12 - Precalculus

MA19.PRE.30

Identify the effect on the graph of replacing $f(x)$ by $f(x) + k$, $k \cdot f(x)$, $f(k \cdot x)$, and $f(x + k)$ for specific values of $k$ (both positive and negative); find the value of $k$ given the graphs. Extend the analysis to include all trigonometric, rational, and general piecewise-defined functions with and without technology.

COS Examples

Example: Describe the sequence of transformations that will relate y=sin(x) and y=2sin(3x).

Unpacked Content

Knowledge

Students know:
  • Graphing techniques of functions.
  • Methods of using technology to graph functions.

Skills

Students are able to:
  • Accurately graph functions.
  • Check conjectures about how a parameter change in a function changes the graph and critique the reasoning of others about such shifts.
  • Identify shifts, stretches, or reflections between graphs.

Understanding

Students understand that:
  • Graphs of functions may be shifted, stretched, or reflected by adding or multiplying the input or output of a function by a constant value.

Vocabulary

  • Horizontal shift
  • Vertical shift
  • Horizontal stretch/shrink
  • Vertical stretch/shrink
  • Reflection
  • Phase shift
  • Amplitude
  • Midline
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