Find each of the following products:
(7x + 2y) × (x + 4y)
By using horizontal method,
We have;
= (7x + 2y) × (x + 4y)
= 7x(x +4y) + 2y(x + 4y)
= 7x2 + 28xy + 2xy + 8y2
= 7x2 + 30xy + 8y2