Question

product (x +y) (x 2 - 3xy +9y2
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Answer 1

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$(x + y)( {x}^{2} - 3xy + 9 {y}^{2} ) = \\ ( {x}^{3} + 9 {y}^{3} - 2 {x}^{2}y + 6x {y}^{2} )$

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