Advanced Math practice question

Answer: 4

Vertex form y = (x − h)² + k places the vertex at (h, k) = (4, 2), so a = 4.

Common wrong answers

If you answered 2

2 is b, the vertex's y-coordinate.

If you answered 6

Do not add h and k; the x-coordinate is 4 alone.

If you answered -4

The sign flips when reading h from (x − h): here h = +4.

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