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2y + 2xy' + 4y + 4xy' = 0 6y + 6xy' = 0 y' = -y/x
The is a straight line parallel to the y-axis with an x intercept at -3.
rearrange: y = 3x - 3, which crosses the x-axis when y = 0, ie when x = 1
4xy - 2y(x + 4) = 4xy - 2xy - 8y = 2xy - 8y = 2y(x - 4)
(2x2+4xy-3)-(x2-2xy-4)Answer: x2+6x+1