Determine whether the graph of the function is symmtetric about the y-axis, the origin, or neither.

y= x^2 - 2x - 1

Is it simply just plugging in -x for the values of x and all that jazz? The other one was y=x^(1/5). I found out that f(-x) = -f(x) so it was an odd function and symmetric with the origin. What's going on in the x^2 example?>