d^2 - 9d + 20 d^2 -2d - 8
___________ + ______________
d^2 - 3d - 10 d^2 +4d - 32
(d -5) ( d - 4) + (d -4) (d + 2)
___________ ___________
(d - 5) ( d + 2) (d + 8) ( d - 4)
(d - 4) + (d + 2)
_____ _____
(d + 2) (d + 8)
(d - 4)(d + 8) + (d + 2) (d + 2)
________________________
(d + 2) (d + 8)
d^2 - 4d + 8d - 32 + d^2 + 2d + 2d + 4
_______________________________
(d + 2) (d + 8)
2d^2 + 8d - 28
_____________
(d + 2) (d + 8)