Question

http://awesomescreenshot.com/0af2avnn25

Answer 1

The zeroes are when y=0. Since y = (x+3)(x-3)(x-4), we have:
\[0 = (x+3)(x-3)(x-4)\]
The only way for numbers to multiply to get zero is if one of the numbers is zero.
So, (x+3), (x-3), or (x-4) = 0 for y to equal zero

Solve the 3 equations for x to get the three zeroes:
x+3 = 0
x-3 = 0
x-4 = 0

Answer 2

3, -3, and 4?

Answer 3

-4*

Answer 4

The first one would get you x = -3 (subtract 3 from both sides), and the other two get you +3 and +4