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The equation of a parabola with two roots and a vertex located at (7,-13) can be written in the form of y = ax^2 + bx + c, where a, b, and c are constants. Which of the following could be the value of a + b + c? I cannot seem to figure out this question?

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The equation of a parabola with two roots and a vertex located at (7,-13) can be written in the form of y = ax^2 + bx + c, where a, b, and c are constants. Which of the following could be the value of a + b + c? I cannot seem to figure out this question?	1