Find all the zeros of the function. When there is an extended list of possible rational zeros,

Question:

Find all the zeros of the function. When there is an extended list of possible rational zeros, use a graphing utility to graph the function in order to disregard any of the possible rational zeros that are obviously not zeros of the function.
1. f (x) = x3 + 24x2 + 214x + 740
2. f (s) = 2s3 − 5s2 + 12s - 5