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Function Transformations. Goal(s): Analyze the effects on a graph when the parameters of the equation are changed Vertical shifts Horizontal shifts Reflections Vertical stretches or compressions Horizontal stretches or compressions. Vertical Shifts. Given a graph f(x):.
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Function Transformations Goal(s): Analyze the effects on a graph when the parameters of the equation are changed Vertical shifts Horizontal shifts Reflections Vertical stretches or compressions Horizontal stretches or compressions
Vertical Shifts Given a graph f(x): Compare it to f(x) + 3:
Vertical Shifts Given a graph f(x): Compare it to f(x) – 2:
Vertical Shifts In general, a graph f(x) + k is the graph of f(x) shifted up(+) or down(-) k units. So f(x) + 5is shifted up 5 units from f(x) and f(x) – 8is shifted down 8 units from f(x).
Horizontal Shifts Given a graph f(x): Compare it to f(x + 3):
Horizontal Shifts Given a graph f(x): Compare it to f(x – 1):
Horizontal Shifts In general, a graph f(x - h) is the graph of f(x) shifted left(+) or right(-) h units. So f(x + 5)is shifted left 5 units from f(x) and f(x – 8)is shifted right 8 units from f(x).
Reflection over the x-axis Given a graph f(x): Compare it to -f(x): In general, a graph -f(x) is the graph of f(x) reflected over the x-axis.
Vertical Stretch or Compression Given a graph f(x): Compare it to 2f(x):
Vertical Stretch or Compression Given a graph f(x): Compare it to f(x):
Vertical Stretch or Compression In general, a graph af(x) is the graph of f(x) vertically stretched or compressed. If a<1, there is a compression If a >1, there is a stretch So f(x)is vertically compressed by a factor of ½ and 4f(x)is vertically stretched by a factor of 4
Horizontal Stretch or Compression Given a graph f(x): Compare it to f(3x):
Horizontal Stretch or Compression Given a graph f(x): Compare it to f(x):
Horizontal Stretch or Compression In general, a graph f(bx) is the graph of f(x) horizontally stretched or compressed. If b<1, there is a stretch If b >1, there is a compression So f(x)is horizontally stretched by a factor of 2 and f(4x)is horizontally compressed by a factor of
Function Transformations • Given a function, f(x) the following are general transformations of the graph of the function: -af(b(x-h))+k • h horizontal shift (left or right) • b horizontal stretch or compression • a vertical stretch or compression • (in front of function) reflection over x-axis • k vertical shift (up or down)