SAT Math Multiple Choice Question 61: Answer and Explanation

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Question: 61

1. Which of the following equations has a vertex of (3, -3) ?

  • A. y = 5(x - 3)2 - 3
  • B. y = 5(x + 3)2 - 3
  • C. y = 5(x - 3)2 + 3
  • D. y = 5(x + 3)2 + 3

Correct Answer: A

Explanation:

A The vertex form of a parabola is y = a(x - h)2 + k, where (h, k) denotes the vertex. Plug in the point (3, -3) into the vertex form to get y = a(x - 3)2 - 3. The correct answer is (A).

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