3x^2+4xy-6xy-8y^2
3x^2-2xy-8y^2
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3x^2+4xy-6xy-8y^2
3x^2-2xy-8y^2
= x(3x + 4y) - 2y (3x + 4y)
= x.3x + x.4y - 2y.3x - 2y .4y
= 3x² + 4xy - 6xy - 8y²
= 3x² - 2xy - 8y²