Question
Factorise : $4 x^2-12 a x-y^2-z^2-2 y z+9 a^2$
✓
Answer
$(2 x-3 a+y+z)(2 x-3 a-y-z)$
[Hint. Given Exp. $\left.=\left(4 x^2-12 a x+9 a^2\right)-\left(y^2+z^2+2 y z\right)\right]$
[Hint. Given Exp. $\left.=\left(4 x^2-12 a x+9 a^2\right)-\left(y^2+z^2+2 y z\right)\right]$
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