-3(x-3y) +6(XC-3y) ² factorise
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Step-by-step explanation:
= -3[x-3y-2(xc-3y)²]
=-3[x-3y-2(cx-3y)²]
=-3[x-3y-2(c²x²-6cxy+9y²)]
=-3(x-3y-2c²x²+6cxy-18y)²
=-3(x-3y-2c²x²+12cxy-1
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