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x² -5x -(-3x² -9x)
= x² -5x +3x² +9x
= x² +3x² -5x +9x
= 4x² +4x
2. Dibailik dahulu, sehingga :
x² +3x +2 -(4x² +2x -7)
= x² +3x +2 -4x² -2x +7
= x² -4x² +3x -2x +2 +7
= -3x² +x +9
Itu jawabannya.