PSAT Math Multiple-Choice Practice Question 689

Correct Answer: B

Explanation:

(B) The vertex form of a parabola is y = (x - h)² + k, where (h, k) are the coordinates of the vertex. Our original equation can be written in this form as y = (x - 0)² + 3. So h = 0 and k = 3.

The second parabola would be written as y = (x - 5)² + 6. So h = 5 and k = 6.

Therefore, h increases by 5 and k increases by 3, which is choice (B).