Please help with solving the following inequalities (2):

1)

I read in the book that you're supposed to factor and then plug in some "key" numbers that will cause the equation to equal zero (if I'm understanding this correctly). The only thing that I could come up with was:

(x+8) (x-4), but plugging in an '8' in the equation doesn't equal zero. How would I solve this? Thanks in advance.

2) This is an inequality that's just one variable (not sure how to proceed):

≥ 0

Thanks for your help!