The expression 6y^2 - y - 15 can be rewritten as A(y - B)(y - C). Find A + B + C.
y^2 +(- B-C) y + BC = 6y^2 -y-15
A = 6
- B-C = -1 ( and BC = -15 )
B+C = 1
then A + B+ C = 6 +1 = 7
