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  1. Home
  2. 12th grade
  3. Precalculus
  4. Exercise : Identify a basic transformation from a graph

Identify a basic transformation from a graph Precalculus

Find which transformation had to be done to graph the red curve g\left(x\right) from the blue one f\left(x\right).

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The blue graph opens up and any shift or horizontal reflection keeps the direction. So the only possibility is that the red curve is a vertical reflection of the blue curve.

The red curve is an vertical reflection of the blue curve.

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We can see that the line x=0 is the axis of symmetry. Therefore

The red curve is an horizontal reflection of the blue curve.

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Since the direction of the graphs are the same, we conclude that it is a downward shift of 4 units.

It is a downward shift of four units.

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Since any shift or horizontal reflection keeps the direction. So the red curve is a vertical reflection of the blue curve. The axis of symmetry is the line y=0

The red curve is an vertical reflection of the blue curve.

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Since the direction is not changed so it can not be a vertical reflection. It could be a horizontal reflection but the axis of symmetry is not the y -axis. So the only possibility is a shift. We can see that the red curve is 3 units on the right of the blue one, so it is a shift to the right.

a shift of 3 units to the right

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We can see that the line y=x is the axis of symmetry. So it is a reflection across the line y=x

It is a reflection across the line y=x.

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We can see that the line y=1 is the axis of symmetry. So it is a horixontal reflection across the line y=1

The red curve is an horizontal reflection of the blue curve.

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See also
  • Course : Transformations of functions and families of functions
  • Exercise : Identify a basic transformation from an equation
  • Exercise : Identify odd functions from equations
  • Exercise : Identify even functions from equations
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