Enter the function into your graphing calculator to determine the zeros. Zeros are points on the graph where the function's lines cross either the x or y axis. For example, in the function f(x)= x^3 + 2x^2 - x - 2, the zeros are 1, -1 and -2.
Solve for the numbers where your lines intersect the graph lines. In the example, you would be solving for f(1), f(-1) and f(2). When all of these are solved, the answer becomes zero.
Check your answers by factoring the equation to its simplest form. This will allow you to see why you got the answers you did. In the example, the problem factors to ( x - 1 ) ( x + 1 ) ( x - 2 ).