Question

please solve Question 12

Answer 1

α + β = -b/a  = 5/3

αβ = c/a = 1/3

α³ + β³  = (α  + β)³ -  3αβ(α+β)

     =  (5/3)³    -   3 * 1/3 (5/3)

   = 125/27 -  5/3   = 125/27  - 45/27   = 80 / 27