Edugoog
α and β are the roots of the equation$x^2 - 9x + 8 =0$Here, a =1, b = -9 and c = 8.`. α + β = ${-b}/a = {-(-9)}/1 = 9$ and .`. αβ = ${c/a} = {8/1} = 8$-> $α^2 + β^2 $= $(α + β)^2 - 2αβ $= $(9)^2 - 2(8)$= 81 - 16= 65