factorise 4a²-9b²-16c²+24bc
please do fast
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4a²-9b²-16c²+24bc
=(2a)²-(3b)²-(4c)²+24bc
=(2a)²-{(3b)²-24bc + (4c)²}
=(2a)²-{(3b)²-(4c)²}
=(2a)²-(3b+4c)(3b-4c)
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