What are u chatting about this's just the sum from the roots is -b/a that's 21 plus the solution in the roots is 91 (-d/a) which u can solve and type an equation to obtain alpha or beta then locate the other 1 then u contain the roots. It took https://brooksqkwvz.thekatyblog.com/34404560/the-definitive-guide-to-case-study-solution