Confused on how to do this

Paragraph Clipboard Font Given the function f(x) = x3 - 5x24 9x - 1. Work the following problems: a) The Domain of f(x) is: O (0, 00) O (9, 00) U ( - 00, - 1) O [ - 1, 00) 0 ( - 00, 00) 0 [0, 00) O None of the Above. b) Find the y - intercept. y c) Find the coordinates of all relative maxima and minima. Express all answers as decimals rounded to two decimal places. 1) There is a relative maximum at: c = and y = 2) There is a relative minimum at c = and y =