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You can think of the formula for finding the vertex of a quadratic function as being (x, y) = [(-b/2a), f(-b/2a)] . This just means that to get the y value, you have to find the x value based on the formula and then plug it back into the equation. Here's how you do it: 1  y = x 2 + 9x + 18.
Students can graph the equation then look for the matching graph, or they can take a graph find the matching equation. Equations are in both standard and vertex form. You can also have student match the equations together to work on changing equations from one form to the other. This sort can be used if you have the students graph using transformations or if they find the vertex and 4 more points. Alternate Ideas and Uses for graphs.