Which equation has a graph that is a parabola with a vertex at (–1, –1)?
Answer
A
y = (x – 1)2 + 1
B
y = (x – 1)2 – 1
C
y = (x + 1)2 + 1
D
y = (x + 1)2 – 1
Explanation
A parabola in vertex form is y = (x − h)² + k, where its vertex is (h, k). For a vertex of (−1, −1), the equation is y = (x + 1)² − 1, which is choice D.
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