What are the zeros of the function? graph the function. y=(x+3)(x-3)(x-4)

The zeroes are the x intercepts, aka the points where the line crosses the x axis. So in your equation we will have an x-intercept where any of the parenthesis is equals to 0. Lets begin
x+3=0
x= -3

x-3=0
x= 3

x-4=0
x=4

So your zeroes are x= -3, 3, 4

You can use this site to graph your equation:
https://www.desmos.com/calculator