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2. 6x^2 -15xy -7y^2
3. 30x^3 -15x^2y
=-14x +y+7z atau jadi 14x -y-7z
2a.) 5x^2-9xy-4y^2 - x^2+6xy +3y^2
= 4x^2-7y^2-15xy
3a.) 5x^2(6x-3y)
=35x^3-15x^2y
4a.) 4x^3+12x^2-x-15 ÷ 2x^2+3x-5
=4x^3+6x^2-3x+3