What is the x-coordinate where the graph of the function represented by the Maclaurin series 1 minus x squared over 2 plus x to the 4th power over 2 factorial minus x to the 6th power over 3 factorial plus dot, dot, dot, negative 1 raised to the nth power times n to the 2 times n power over n factorial plus dot, dot, dot intersects the graph of y = x3 ?