-14xy-x²-49y² 3x³-12x²y+12xy²

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-14xy-x²-49y²3x³-12x²y+12xy²-14xy-x²-49y²3x³-12x²y+12xy

-14xy-x²-49y² 3x³-12x²y+12xy²
-14xy-x²-49y² 3x³-12x²y+12xy²

-14xy-x²-49y² 3x³-12x²y+12xy²
-14xy-x²-49y²
=-(x²+14xy+49y²)
=-(x+7y)²
3x³-12x²y+12xy²
=3x(x²-4xy+4y²)
=3x(x-2y)²