Which equation has a graph that is a parabola with a vertex at open paren negative 1 comma negative 1 close paren ?
Answer
A
y is equal to open paren x minus 1 close paren squared minus 1
B
y is equal to open paren x plus 1 close paren squared minus 1
C
y is equal to open paren x plus 1 close paren squared plus 1
D
y is equal to open paren x minus 1 close paren squared plus 1
Explanation
A parabola in vertex form is y = (x - h)² + k, where its vertex is (h, k). For the vertex (-1, -1), substitute h = -1 and k = -1 to get y = (x + 1)² - 1, which is choice A.
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