4xy²-4x²y-y³
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4xy²-4x²y-y³4xy²-4x²y-y³4xy²-4x²y-y³4xy²-4x²y
4xy²-4x²y-y³
4xy²-4x²y-y³
4xy²-4x²y-y³
4xy²-4x²y-y³
=-y(4x²-4xy+y²)
=-y(2x-y)²
4xy²-4x²y-y³
=-y(y²-4xy+4x²)
=-y(y-2x)²
4xy²-4x²y-y³
=-y(-4xy+4x²+y²)
=-y(2x-y)²