Question

factorise...............

Answer 1

$9(x + y)^{2} - {x}^{2}$

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

$= (3x + 3y + x)(3x + 3y - x)$

$= (4x + 3y)(2x + 3y)$

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Answer 2

$= > 9 {(x + y)}^{2} - {x}^{2}$

$= > {(3x + 3y)}^{2} - {x}^{2}$

$= > (3x + 3y + x)(3x + 3y - x)$

$= > (4x + 3y)(2x + 3y)$