Q17 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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