Please answer clearly and in detail

7. Points=2 The ternary search algorithm locates an element in a list of increasing integers by successively splitting the list into three sub-lists of equal (or as close to equal as possible) size, and restricting the search to the appropriate piece. Specify the steps of this algorithm. 8. Points=2 Use definition of Big-O to show that (x3 + 2x)/(2x + 1) is O(x)