List the possible rational zeros for each function.

1. f(x)= 2x^3 - 3x^2 + 4x - 18
2. f(x) = x^4 - 3x^2 + 2x + 24

Find the zeros of each function

3. f(x)= 2x^3 + 2x^2 - 8x -8
4. f(x)= x^3 + x^2 - 10x + 8​