Suppose we want to divide
4y 3 + 5y 2 + 6y ÷ 2y
We first factorise both of them separately
4y 3 + 5y 2 + 6y = 4 × y 3 + 5 × y 2 + 6 × y
= 2 × 2 × y × y × y + 5 × y × y + 2 × 3 × y
2y = 2 × y
Now, Dividing
(4y 3 + 5y 2 + 6y)/2y = (2 × 2 × y × y × y + 5 × y × y + 2 × 3 × y)/(2 × y)
= (2 × 2 × y × y × y)/(2 × y) + (5 × y × y )/(2 × y) + (2 × 3 × y)/(2 × y)
= 2 × y × y + 5/2 × y + 3
= 2y 2 + 5/2 y + 3