9x2+16y2+4-24xy-16y+12x
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9x²+16y²+4-24xy-16y+12x
=9x²+16y²-24xy+4-16y+12x
=(3x-4y)²- 4(1-4y+3x)
=9x²+16y²-24xy+4-16y+12x
=(3x-4y)²- 4(1-4y+3x)
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