Inequalities/writing set in interval notation

So far I've gathered that the critical numbers are x = 1 and x= -2. I graphed them on the number line. I plugged in test values for each of them.

When I do that, for every test value I've plugged in they've been .

Now I don't know what that means. Does that mean that since every test proved to be a positive, it'll be the whole thing?

The test intervals were .

I'm also confused on this problem:

I already know what it turns into.

That wasn't the hard part. The hard part is figuring out the critical numbers for this.

1 -x+x -x^2

and

is supposed to be a critical number, but I don't know how you get that.