The graph of which function has an axis of symmetry at x = 3?fx = 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.fx = 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.fx = 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.fx = 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.