1/X1+1 + 1/X2+1= dari akar persamaan kuadrat 3X^2+X+2

jawab

3x^2 + x + 2 = 0
x1 + x2 = -1/3
x1, x2 = 2/3

1/(x1+ 1) + 1/(x2+1) = 

= (x1+x2 +2)/(x1.x1 + x1+x2 + 1)
= (-1/3  + 2) / ( 2/3 - 1/3 + 1)
= ( 5/3 )/(4/3)
= 5/4