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 .

Answer:

1. ; Maximum value

2a.

2b. or