What are u chatting over it's just the sum on the roots is -b/a and that is 21 and also the merchandise of your roots is 91 (-d/a) which u can remedy and sort an equation to obtain alpha or beta then discover another 1 then u possess the roots. https://case-solution50563.thezenweb.com/the-definitive-guide-to-case-study-writing-help-73913842