Similarities- -Both graphs have the same shape (open downward, same symmetry axis, same, x-coordinate of the vertex). Differences- -the maximum value of -2x^2 is 0 -the maximum value of -2x^2 + 4 is 4-the graph of y= -2x^2 + 4 is the graph -2x^2 shifted 4 units upward as consequence of having summed 4 to the function.