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Read the following SAT test question and then click on a button to select your answer.
The quadratic functionis graphed in the-plane above. If for all values of, which of the following could be the coordinates of point?
Answer Choices
(A)
(B)
(C)
(D)
(E)
The correct answer is C
Explanation
The fact thatfor all values ofmeans that the pointis the maximum of the quadratic function, somust be the vertex of the parabola. The parabola intersects the-axis at the pointsand, somust be halfway betweenand. Therefore,. Of the choices, the only one with-coordinate equal tois. Therefore,could be the coordinates of point.
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