Question

The minimum of a parabola is located at (–1, –3). The point (0, 1) is also on the graph. Which equation can be solved to determine the a value in the function representing the parabola?

1 = a(0 + 1)2 – 3
1 = a(0 – 1)2 + 3
0 = a(1 + 1)2 – 3
0 = a(1 – 1)2 + 3

Answer 1

Use vertex form y = a(x - h)^2 + k with vertex (h,k) = (−1, −3): y = a(x + 1)^2 − 3. Plug in (0,1): 1 = a(0 + 1)^2 − 3.

So the correct choice is the first equation.