(a) Use the Intermediate Value Theorem and the table feature of a graphing utility to find intervals one unit in length in which the polynomial function is guaranteed to have a zero.
(b) Adjust the table to approximate the zeros of the function to the nearest thousandth. Use the zero or root feature of the graphing utility to verify your results.
1. f (x) = 3x3 − x2 + 3
2. f (x) = 0.25x3 − 3.65x + 6.12
3. f (x) = x4 − 5x - 1
4. f (x) = 7x4 + 3x3 − 8x2 + 2