I don't know how to solve this! Can someone show the formula?
1. Find all possibles values of k such that the equation has real roots. If and are real roots of this equation, show that . Hence, find the maximum value .
2a. If is a factor of the polynomial , determine the value of k. With this value of k, find all four zeroes of .
2b. Find the solution set of the inequality .
1. ; Maximum value