6: Factorise (4y2 - 12xy + 9x2) - 4z2.
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Step-by-step explanation:
=(9x2+4y2-12xy)-4z2
=(3x-2y)^2-(2z)^2
=(3x-2y+2z)(3x-2y-2z) [using identity a^2-b^2]
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