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(b² +ab -3a²) -(a² -ab -b²)
b² +ab -3a² -a² +ab +b²
-3a² -a² +ab +ab +b² +b²
-4a² +2ab +2b
2. -3(p² -5p +2) -5(2p² +p +11)
-3p² +15p -6 -10p² -5p -55
-3p² -10p² +15p -5p -6 -55
-13p≥ +10p -61
3. (7 -3y -y²) -(2y² +1)
7 -3y -y² -2y² -1
-y² -2y² -3y +7 -1
-3y² -3y +6
4. (-x² +2x -5) -(x² +8x -5)
-x² +2x -5 -x² -8x +5
-x² -x² +2x -8x -5 +5
-2x² -6x