Ex 8.4, 2 (ii) - Chapter 8 Class 8 Algebraic Expressions and Identities

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Ex 8.4, 2 (ii) - Find (x + 7y) (7x - y) - Chapter 9 Class 8 - Ex 8.4

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Ex 8.4, 2 Find the product. (ii) (𝑥+7𝑦) (7𝑥−𝑦) (𝑥+7𝑦) (7𝑥−𝑦) = 𝑥(7𝑥−𝑦)+7𝑦(7𝑥−𝑦) = (𝒙 × 𝟕𝒙)−(𝒙 × 𝒚)+(𝟕𝒚 × 𝟕𝒙)−(𝟕𝒚 × 𝒚) = 7𝑥^2−𝑥𝑦+49𝑦𝑥−7𝑦^2 = 𝟕𝒙^𝟐+𝟒𝟖𝒙𝒚−𝟕𝒚^𝟐

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