The expansion of (3a-4b-2c)2² is:

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A9a²+16b²+4c²-24ab + 8bc + 12ac

B9a² + 16b² + 4c² + 12ab-8bc + 6ac

C9a² + 16b² + 4c²-24ab+16bc-12ас

D9a² + 16b² + 4c²-24ab + 16bc- бас

Answer:

$(ax+by+cz)^2=a^2x^2+b^2y^2+c^2z^2+2abxy+2bcyz+2caxz$

9a² + 16b² + 4c²-24ab+16bc-12ас

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