Since one root is: , then other root is: 

Sum of roots:  = 4

Sum of roots: , so  --------- eq (i)



Product of roots:  -----> 4 - 2, or 2

Product of roots: , so ________________ 

 ---------- Substituting 1 for a in eq (i)

- b = 4 ---------- Cross-multiplying

 

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