ACT Preparation / Unit 10 ACT 0918 short lesson, about 20 seconds
Horizontal Shifts
Captions available
The idea
Replacing x with x − h, giving f(x − h), shifts the graph right by h; f(x + h) shifts it left.
In practice
(x − 4)² is the parabola x² moved right 4, with its vertex at (4, 0).
Where people slip
The sign runs opposite to intuition: minus inside moves right. Ask what input makes the inside zero.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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