Question

Which equation has a graph that is a parabola with a vertex at (-1, -1)?
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Answer 1

See below.

Explanation:

The vertex form of a parabola is

y = a(x - b)^2 + c where (b, c) is the vertex so when the vertex is (-1, 1) the equation is

y = a(x + 1) ^2 - 1.

where a is some constant.

Is there a list to choose from?