The only way this question makes any sense at all is if you really meant to say: "Find a polynomial function of degree 3 with the given numbers as zeros of the function. Therefore, I shall presume that is what you meant. However, before continuing I would like to caution you to take more care to state your questions accurately lest the tutors on this site get annoyed with your cavalier attitude and begin to ignore your requests for help.
If the zeros of a 3rd degree polynomial function are -2, 3, and 5, then the factors of the polynomial must be:
Hence:
You will need to multiply the three binomials to get the proper final form of your answer.