I'm not sure what the 1- is (what's being cubed). But to find out if it's odd or even, plug in a negative x where x is. Since I'm assuming you're not working with complex numbers, either you have an absolute value around the x, in which case you would get exactly the same function (even, or odd if 1- is x), or you have a restricted domain (only on the right side of the y axis) and it's neither odd nor even because you can't put a negative x in.