What are the x-intercepts of the graph of the function f(x) = x^2+ 5x - 36?
(-4,0) and (9,0)
(4,0) and (-9, 0)
(-3,0) and (12,0)
(3, 0) and (-12, 0)

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.