factorise 27x³- y³ - z³ - 9xyz
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Step-by-step explanation:
27x³-y³-z³-9xyz
=(3x)³-y³-z³-3(3x)ys
=(3x-y-z){(3x)²+y²+z²-(3x)y-yz-z(3x)}
=(3x-y-z)(9x²+y²+z²-3xy-yz-3zx).
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