The factors of 7are -1 and 7 or 1 and -7, the factors of 14 are 1, 2, 7, and 14, or -1, -2, -7,-14. so the list of potential zeros are: 1/1, 1/2, 1/7, 1/14, 7/1,7/2, 7/7, 7/14, which can be simplified into 1, 1/2,1/7, 1/14, 7, 7/2 add the negative ones: -1, -1/2,-1/7, -1/14, -7, -7/2 I believe there are a total of 12 potential zeros reference: http://www.sparknotes.com/math/algebra2/polynomials/section4.rhtml
If you use Desmos it'll give you these points: (-2,0) (-2,2) (-2,-2) Since it's perfectly straight line, all the points with begin with -2. It's the same for graphs like y=-2, which would make them all end in -2. Hope this helped!
