1.

Find each of the following products: (7x + 2y) × (x + 4y)

Answer»

By using horizontal method, 

We have; 

= (7x + 2y) × (x + 4y) 

= 7x(x +4y) + 2y(x + 4y) 

= 7x2 + 28xy + 2xy + 8y2 

= 7x2 + 30xy + 8y2



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