Question

Factorise: x²+9y²+6xy-z²​

Answer 1

$\orange {\boxed{Answer}}$

$= {x}^{2} + 9y {}^{2} + 6xy - {z}^{2}$

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

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

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