Q : 3    Simplify.

            (vi)  (x+y)(x^2-xy+y^2)

Answers (1)

simplification is done as follows

(x + y) X (x^{2} -xy + y^{2})  = x X (x^{2} -xy + y^{2}) + y (x^{2} -xy + y^{2})
                                              = x^{3} -x^{2}y + xy^{2} + yx^{2} - xy^{2} + y^{3}
                                              =x^{3}+ y^{3}  

 

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