ACT Preparation / Unit 10 ACT 0919 short lesson, about 20 seconds
Reflections
Captions available
The idea
−f(x) reflects the graph over the x-axis, flipping it upside down. f(−x) reflects it over the y-axis, swapping left and right.
In practice
−x² is x² turned upside down; √(−x) is √x mirrored to the left.
Where people slip
The position of the minus sign decides the axis: outside affects outputs, inside affects inputs.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
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