If the equation for a parabola is y = 5(x - 3)2 - 3, which of the following points represents the parabola's vertex?
A. (3, -3)
B. (3, 0)
C. (0, -3)
D. (-3, 3)
Answer:A
If the equation for a parabola is y = 5(x - 3)2 - 3, which of the following points represents the parabola's vertex?
A. (3, -3) B. (3, 0) C. (0, -3) D. (-3, 3)
Explanation: A Whenever the question includes variables and the answers are numbers, think Plugging In the Answers. In (A), x = 3 and y = -3. Plug these numbers into the equation to get -3 = 5(3 - 3)2 - 3. Solve the right side of the equation to get -3 = 5(0)2 - 3 or -3 = 0 - 3. The correct answer is (A). None of the other points work when plugged into the equation, so eliminate (B), (C), and (D).