find value of B which factor 2 X + 3 factor of 2 x cube + 9 x square minus x minus b

find value of B which factor 2 X + 3 factor of 2 x cube + 9 x square m

1.	find value of B which factor 2 X + 3 factor of 2 x cube + 9 x square minus x minus b
Answer» I want explanasion b=15