Factorise
4x²-12xy +9y²-64
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Step-by-step explanation:
4x²-12xy+9y²-64
=(2x)²-2(2x)(3y)+(3y)²-8²
=(2x-3y)²-8²
=(2x-3y+8)(2x-3y-8).[a²-b²=(a+b)(a-b)]
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