How do you know if an interval is positive or negative?

How do you know if a interval is positive or negative?

Video quote: So positive intervals would be those that lie above the x axis. And negative intervals would be those that lie below the x axis.

How do you know which interval is positive?

At x equals a or at x equals b the value of our function is zero but it’s positive when x is between a and b, a and b or if x is greater than c. X is, we could write it there, c is less than x or we could write that x is greater than c. These are the intervals when our function is positive.

How do you find the negative interval?

Video quote: And when is a graph. Negative right so let's write down our answers. Now. So for the first one we'll say positive is when X we see we could write x belongs to real numbers where X is less than I mean