Notice: When 1 is subtracted from the parent function, the graph sits 1 unit below the parent function.
The vertex of y = x2 - 1 is (0,-1).
Quadratic Function - Parent Function and Vertical Shifts
From Jennifer Ledwith
Example 2: Decrease c
Blue parabola: y = x^2 Green parabola: y = x^2 - 1
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