1) (2y+c)(3y-c) = 2y3y - 2yc + 3yc - c^2= 6y^2 - 2yc + 3yc - c^2= 6y^2 + yc - c^2
2) (8a^4 + 2a^3) / 2a^3 = 4a + 1
1) (2y+c)(3y-c) = 2y3y - 2yc + 3yc - c^2
= 6y^2 - 2yc + 3yc - c^2
= 6y^2 + yc - c^2
2) (8a^4 + 2a^3) / 2a^3 = 4a + 1