You won't be able to. The site will let you try, then tell you that you're not allowed to delete it because it has already received an up voted answer.
So the answer can be inferred: it's not okay.
In exceptional circumstances, a mod can deleteddelete the question anyway. Alternatively, you can request to have a post dissociated from your account. But a low score isn't an exceptional circumstance and these two options are unlikely to be available.