to come back to Tutorial Exercise Determine whether the function's vertex is a maximum point or a minimum point and find the coordinates of this point. Find the zeros, if any exist, and sketch the graph of the function. y=x-x Step 1 First write the function in general form, y = ax + bx + c. +x Since a 0, the parabola opens downward downward So, is the vertex a maximum or a minimum? The vertex is a maximum point. The vertex is a minimum point. Step 2 The coordinates of the vertex of a quadratic function of the form y = ax2 + bx + care GG Use the values of a and b to determine the x-coordinate of the vertex. -b x = -1