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12x^2 + 2xy - 10y^2
12x^2 + 12xy -10xy - 10y^2
12x(x+y) - 10y(x+y)
(12x-10y)(x+y)
2.
(x-4y)(x^2+4xy+16y^2)
x^3+4x^2y+16xy^2-4x^2y-16xy^2-64y^3
x^3-64y^3
Benar