What does this question mean? Determine the intervals where f(x) > o and where f(x) < o

Question

What does this question mean?

Determine the intervals where f(x) > o and where f(x) < o

Answer 1

if you graphed the function, find the x values where y is above the x axis and where y is below the x axis

take an example such as y f(x) =x

the interval where y>0 is when x>0, and the interval where y <0 is when x<0

in interval notation

(-infinity, 0) is the interval where f(x)<0

and

(0, + infinity) is the interval where f(x)>0