Question

343x3 +27y3 factorise​

Answer 1

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Answer 2

$343 {x}^{3} + 27 {y}^{3} \\ = (7x) {}^{3} + (3y) {}^{ 3} \\ = (7x + 3y)((7x) {}^{2} + (3y) {}^{2} - 7x \times 3y) \\ = (7x + 3y)(49x {}^{2} + 9y {}^{2} - 21xy)$

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