Use synthetic division to divide f(x) = x³ - 2x² - 23x + 60 by x – 4. Use the result to find all zeros of f.
(x³ - 2x² - 23x + 60) ÷ (x - 4) =
(Do not factor. If there is a remainder, type your answer in the form quotient + remainder/divisor)
The zeros of f are (-5,3,4). (Use a comma to separate answers as needed.)