Answer:
(d+6) (2d)(2-d+7)
Step-by-step explanation:
(d+6) (2d)(9-d)
(d+6)(18d-2d²)
(d+6)(2d²-18d)
(d+6)(2(9)-18(9)
(d+6)(18-162)
(d+6)(-144)
-144d-54=0.......... multiply the given equation
with(-) minus
144d+54=0
d=54\144
d=1/2.67
