Q18 of 95 Page 87

Find each of the following products:

(x2 + xy + y2) × (x – y)

By using horizontal method,


We have;


= (x2 + xy + y2) × (x - y)


= x(x2 + xy + y2) - y(x2 + xy + y2)


= x3 + x2y + xy2 - x2y – xy2 - y3


By arranging the expression in the form of descending powers of x,


We get;


= (x3 - y3)


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