Write the polynomial as the product of linear factors and list all the zeros of the function.
1. f (x) = x3 + 4x2 − 5x
2. g (x) = x3 − 7x2 + 36
3. g (x) = x4 + 4x3 − 3x2 + 40x + 208
4. f (x) = x4 + 8x3 + 8x2 − 72x - 153