Consider the parabola given by the equation: y = 3x2 + 12x + 9 Does the graph open up or down? Does the graph have a maximum or a minimum? opens up, minimum opens down, minimum opens down, maximum opens up, maximum The vertex is The y-intercept is (0 Find the two values of _ that correspond to the @ -intercepts of the parabola and write them as a list, separated by commas