The red parabola shown is the graph of the equation x = ay^2 + by + c. Find c. (Assume that the graph has the standard unit scale.)
The vertex of the parabola is (3,2), so the equation of the parabola is x - 3 = (y - 2)^2. Then x = y^2 - 4y + 4 + 3 = y^2 - 4y + 7, so c = 7.
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