Ok I've worked on these for a while and can't seem to come up with the right answer. Can someone help me out?

1. f(x) = x^2/1-x

Find the critical points

2. f(x) = x^6 - 3x^4 + 3x^2 - 1

Find the critical points

Were also asked to find the domain, intercepts, symmetry and asymptotes. I'm pretty sure there aren't asymptotes for either one, and I'm pretty sure I got the answers to the others. If you want to answer those to to verify my answers that would be great. Thanks!