You can put this solution on YOUR website! Consider the standard reference parabola, . The center is at (0, 0). Adding or subtracting a number on x will shift right or left. This shift is the whole graph.
will shift the whole graph, including vertex, c units to the right. This means the vertex would be (c, 0).
YOUR task now is to conclude what is the vertex of .
(?, 0).
What point is it?