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Ex 2.5, 11 - Factorise 27 x3 + y3 + z3 - 9xyz - Class 9 - Ex 2.5

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Ex 2.5, 11 Factorise : 27 𝑥﷮3﷯ + 𝑦﷮3﷯+ 𝑧﷮3﷯ – 9xyz 27 𝑥﷮3﷯ + 𝑦﷮3﷯ + 𝑧﷮3﷯ – 9𝑥𝑦𝑧 = 3𝑥﷯﷮3﷯+ 𝑦﷯﷮3﷯+ 𝑧﷯﷮3﷯−9𝑥𝑦𝑧 = 3𝑥﷯﷮3﷯+ 𝑦﷯﷮3﷯+ 𝑧﷯﷮3﷯−3×3𝑥×𝑦×𝑧 = 𝟑𝒙+𝒚+𝒛﷯ 𝟗𝒙﷮𝟐﷯+ 𝒚﷮𝟐﷯+ 𝒛﷮𝟐﷯ −𝟑𝒙𝒚 −𝒚𝒛 −𝟑𝒛𝒙﷯

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