Yes and no. I don't think they'll sweep the world like in the movies, but there are some kind of flesh eating zombies around now thanks to these new synthetic drugs.
The factors of 49 are 1, 7, and 49.
The i is necessary because the 49 is positive. In order for the x^1 part of the polynomial to equal 0, the 7*2x factors must cancel and so the signs must be...