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= 3x^3y -3xy^3 + x^2 - y^2
2. (x + 2) (x^2 +3x +5)
=x^3 + 3x^2 + 5x + 2x^2 + 6x +10
=x^3 + 3x^2 + 2x^2 + 5x + 6x +10
= x^3 + 5x^2 + 11x +10
ket
^ = pangkat