Question

Factorise it ::::::​

Answer 1

Answer:

27x^3 - 343 y^3

(3x)^3 -( 7y)^3

(3x-7y)( 9x^2 + 49 y^2 + 21xy)

Answer 2

$27 {x}^{3} - 343 {y}^{3}$

$= (3x)^{3} - (7y)^{3}$

$= (3x - 7y)( {(3x)}^{2} + 3x \times 7y + (7y)^{2} )$

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

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