A function with zeros -3 and 2 could be:
(x + 3)(x - 2) or x² + x - 6
Keep in mind that there are an unlimited number of functions that have these zeros, such as:
2(x + 3)(x - 2) or 2x² + 2x - 12
(x + 3)(x - 2)(x + 5) or x³ + 6x² - x - 30
Generally, the function just has to include the factors (x + 3) and (x - 2) to have the zeros -3 and 2.