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the graph of which function has an axis of symmetry at x = 3? f(x) = x2 + 3x + 1 on a coordinate plane, a parabola opens up. it goes through (negative 4, 5), has a vertex at (negative 1.75, 6.75), and goes through (1, 5). f(x) = x2 – 3x – 3 on a coordinate plane, a parabola opens up. it goes through (negative 2, 7), has a vertex at (1.75, 5), and goes through (5, 7). f(x) = x2 + 6x + 3 on a coordinate plane, a parabola opens up. it goes through (negative 6, 3), has a vertex at (negative 3, negative 6), and goes through (0, 3). f(x) = x2 – 6x – 1 on a coordinate plane, a parabola opens up. it goes through (0, negative 1), has a vertex at (3, negative 10), and goes through (6, 0).