x³ + xy + 4x - 7x² - 7y - 28 = (x³ + xy + 4x) - (7x² + 7y + 28 ) =
= x(x² + y + 4) - 7(x² + y + 4) = (x² + y + 4)(x - 7)
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x³ + xy + 4x - 7x² - 7y - 28 = (x³ + xy + 4x) - (7x² + 7y + 28 ) =
= x(x² + y + 4) - 7(x² + y + 4) = (x² + y + 4)(x - 7)