Copy of Families of Quadratic functions of the form y = x^2 + c

Enter different values of a and observe what happens to the graph of y = x^2 + c. The graph of y = x^2 is graphed in the black dotted line to compare.
– Ronan Downes, LibraryGhost

Information: Copy of Families of Quadratic functions of the form y = x^2 + c